Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd295e51c0a40645…

MALICIOUS

PDF

82.3 KB Created: 2021-05-22 10:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 609546d1ec904dc8d67f1f02b8c2e330 SHA-1: 58ef411ff2dc8776d6787c987f442c41326f08a0 SHA-256: fd295e51c0a406457d2952833aafc024b4d9b6919caee84c6087b8bcbd975257
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/strik?utm_term=what+organisms+carry+out+cellular+respiration PDF link annotation
    • https://rajevolid.weebly.com/uploads/1/3/0/8/130813967/4090098.pdfIn PDF document text
    • https://rimosuvifakub.weebly.com/uploads/1/3/4/3/134310068/2264869.pdfIn PDF document text
    • https://zafewogi.weebly.com/uploads/1/3/1/4/131407253/4337142.pdfIn PDF document text
    • https://takatika.weebly.com/uploads/1/3/4/6/134605824/1fc13.pdfIn PDF document text
    • https://xijaxerunoseme.weebly.com/uploads/1/3/4/3/134306079/wesinarusipatego.pdfIn PDF document text
    • https://mezinetoxapim.weebly.com/uploads/1/3/4/8/134887379/1459866.pdfIn PDF document text
    • https://jikumudepopojet.weebly.com/uploads/1/3/1/4/131453433/5e592bae646f.pdfIn PDF document text
    • https://kegewibenufugix.weebly.com/uploads/1/3/2/6/132682471/62956a6318c90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450632/normal_60246a9e6b0ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453890/normal_5fda7d9e4a5b8.pdfIn PDF document text
    • https://zusikoxapumobib.weebly.com/uploads/1/3/4/7/134766975/taxajemo_rixodizaxuvi_puzexejef_bokajonuvegonoj.pdfIn PDF document text
    • https://mutalexo.weebly.com/uploads/1/3/1/8/131871787/fikasumiviv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376856/normal_606d6be69ae8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449181/normal_5ff1edabcafa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478127/normal_601f675cd13fd.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/97bbd7ef-6b1b-4906-8d47-d7861e14740f/how_to_fix_timex_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/parts_of_vermiform_appendix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d03fac9b-c6a2-4a40-8363-7e5c379c7335/how_do_you_figure_out_your_mental_age.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb2998c9-75a8-42a6-9a6d-962c66aa2276/adiestrando_un_guerrero_dina_santamaria_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a37281d-28ff-4826-a431-6a2633049a95/taxunuxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e088206-3264-4be5-854f-b2a4fe08aa22/stand_down_meaning_in_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe00270d-50b6-49c5-acca-b03e6014b555/jerarquia_de_operaciones_ejercicios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8d0b4c-37b8-459e-ad5c-8c0ee9b590a1/4420457007.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/lomijim.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_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 5464 bytes
SHA-256: 1dbf0ef1bb7e44e16a1b865fc9ad26f37df72702a97f47d284370a25cb474415
font_01_sfnt_off000114d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D9 11240 bytes
SHA-256: bcc910ebc1c31548df217a079c93760f246a81456ab61f115850f53bb98953af