Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c39d46633b4baa…

MALICIOUS

PDF

79.5 KB Created: 2021-06-09 00:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b72172230caebbb7ad77c4586a211d01 SHA-1: 45b237dbca22ef2017e30ddba10904d3d9858f14 SHA-256: a7c39d46633b4baae685ebb81153dbac0ff939676efa4a8a7767d9d9ddf36d43
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the primary URLs extracted is https://nomylo.ru/pbw?utm_term=aditya+stotram+in+telugu+lyrics, which is likely used to redirect users to further malicious content or phishing pages. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/pbw?utm_term=aditya+stotram+in+telugu+lyrics PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459787/normal_5ff1af1c3ffa3.pdfIn PDF document text
    • https://kujogumaras.weebly.com/uploads/1/3/4/4/134497752/803033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_6034cf218a1ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387037/normal_601885e268436.pdfIn PDF document text
    • https://xidoxuzi.weebly.com/uploads/1/3/4/7/134707988/gagimokizevobafujow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_60666af44aa79.pdfIn PDF document text
    • https://namodezax.weebly.com/uploads/1/3/6/0/136055978/lopuwis_jipekakesad_popinalixavisos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_604bad5e85d44.pdfIn PDF document text
    • https://meliwulawobawis.weebly.com/uploads/1/3/5/2/135298556/6790085.pdfIn PDF document text
    • https://femadupimasimu.weebly.com/uploads/1/3/4/5/134594559/72169715f60878.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/c894f98e-b793-4372-82a2-b6f5b98ddb52/where_to_donate_clothes_to_veterans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d8095dd-066e-4e50-a04d-cf948a504693/fabulas_cortas_ilustradas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f91573e-c4cb-4773-8038-d1b42c33e1f0/is_5x5_good_for_fat_loss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eefa7868-ad1d-426e-ac0f-ff908d1e6db7/are_samsung_washer_and_dryers_reliable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dfdda08-6564-4590-a850-33205dd6f969/how_to_unlock_door_on_maytag_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea9c32e8-889c-4760-baa4-b2897306a913/tesla_model_3_interior_mood_lighting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44df9e3c-03d5-4256-85e7-7684078ac646/43507705376.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fb68317-01c4-4d5d-8055-4c51e7aae145/how_to_use_discernment_spiritual_gift.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ee76027-f2ef-4080-a37d-caddb3a8a730/does_costco_do_sodastream_refills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58d222c2-00f6-4c83-91eb-16d7ec105a9e/what_does_dapple_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a23322d2-350c-49f9-a571-97a66266a285/zomifomezuloxewajarap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73cc198d-c17b-4e44-a9c5-20f7bf455a6e/deploy_full_stack_react_app_to_heroku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/563e5a03-dd14-4d69-a08e-3c8929c25956/30_day_fitness_free_trial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb502d7b-d39d-4976-b557-eecf951c07e7/what_is_the_black_body_radiation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d6673de-50b5-49d4-9325-1772d14ca262/exalted_rpg_classes.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE4 5348 bytes
SHA-256: 87a8c1b037f397465789629b62136db4c149023a99f67911c492bb27e5d85d08
font_01_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 10776 bytes
SHA-256: 7b3cae772811cacd55a77e6c2ab2b3d125d8e729a22fc416a2a0a64eb4f6582c
font_02_sfnt_off00010fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDA 9460 bytes
SHA-256: 6d9617b2a947f6a5a7b53b242bea3a84f7c532c7602c22784a5296ae0ab01904