Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d575b9961810bc0…

MALICIOUS

PDF

72.5 KB Created: 2021-03-15 08:22:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2fadded2e3517db708309b1c9c8eb9a5 SHA-1: 893884505b19ef40a89055e10d789cbdb7aacf42 SHA-256: 1d575b9961810bc02f88e60152f97c163fe7dbfe3a0611eef36eec4174e5d74c
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, with many pointing to disposable hosting services, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the overall structure strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=tappan+range+drip+pans PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478946/normal_5ff77326d6011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472774/normal_6039fd3f9b81c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404959/normal_6009c0dd894b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462056/normal_5fdc90e2842f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/394ab94c-5336-4ebc-857c-46dfacb4be4c/mtd_gold_lawn_mower_oil_change.pdfIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_2b176078a2de4c6789c60f42ef6fb7ad.pdf?index=trueIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_c9b201c78a4c4b169c0407f323aa95bb.pdf?index=trueIn PDF document text
    • https://ac0aa552-aaa7-40d2-95b8-1509c9da40b6.filesusr.com/ugd/7e0eb0_13337becc85c451daada8e44efd8843a.pdf?index=trueIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_8c61742562424585b9500b679c066262.pdf?index=trueIn PDF document text
    • http://feliruxitekul.epizy.com/biography_report_for_middle_schoolers.pdfIn PDF document text
    • http://livivisobozi.rf.gd/bivalaputunafebevivazadir.pdfIn PDF document text
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_b3fb296a5a5c4222849aad0b435ae32c.pdf?index=trueIn PDF document text
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_5c18b01076484f478992c9378bde607a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/949adc94-ce7b-42d1-9156-9dc1c1c2c585/how_to_fill_a_bobbin_on_a_singer.pdfIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_7e10824c1ae747cc8f7ee12ee8e736ac.pdf?index=trueIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_d03111ec4ab84991804ed1431f600fc7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03af0027-a395-4f39-8786-8c56960c4076/betitavafa.pdfIn PDF document text
    • http://rokosarod.rf.gd/how_to_clean_kitchenaid_coffee_maker_14_cup.pdfIn PDF document text
    • http://nolawasewunut.epizy.com/fly_tying_vise_base_parts.pdfIn PDF document text
    • http://rukaxamusotaz.rf.gd/dewalt_drill_and_impact_driver_set_18v_brushless.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE089 5044 bytes
SHA-256: 4b1eb20badc8dfc5d0d1d36109f47f0ea9f32fb6921bd184c76b834bf7c69b9c
font_01_sfnt_off0000f1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 10412 bytes
SHA-256: 54e963c5cf4f23491217f02647dff74d435220d245e34d8bca6e6397102dcd33