Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4a3912c4aa9cbf…

MALICIOUS

PDF

79.8 KB Created: 2021-05-18 01:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 018a2a660e7b52df89a5e68c95261fec SHA-1: de172acfd2311091271a263fee9779032f3356ae SHA-256: 1d4a3912c4aa9cbf8bae3c8675b3b405fbfae3e31b5769e725dbe4e21d205927
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 0.9993

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://zajinet.ru/strik?utm_term=dieta+cetogenica+vegana+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466657/normal_606c88bff183c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411252/normal_600c9f3fc437a.pdfIn PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/jutuxiribudelubuxe.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/xujuduwisadiku.pdfIn PDF document text
    • https://sifijaxamop.weebly.com/uploads/1/3/4/3/134332722/a1006d171592.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450517/normal_602593717618b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376354/normal_6053279c7d2dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408862/normal_5fc913c2c7425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481852/normal_601b7e6a7b5da.pdfIn PDF document text
    • https://daburupolajiwu.weebly.com/uploads/1/3/4/6/134634816/9100043.pdfIn PDF document text
    • https://milikosepawina.weebly.com/uploads/1/3/2/6/132696406/c04fdec91da51.pdfIn PDF document text
    • https://depuxibuf.weebly.com/uploads/1/3/4/7/134762413/dofokod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414331/normal_60308ed7d1acb.pdfIn PDF document text
    • https://tofibozuliven.weebly.com/uploads/1/3/1/1/131163910/e37aee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413368/normal_6042e3ea84f70.pdfIn PDF document text
    • https://tugixafebav.weebly.com/uploads/1/3/2/6/132681891/8688128.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_600dcb95f08ae.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/jekibu_misuzok.pdfIn PDF document text
    • https://tazabojadikeze.weebly.com/uploads/1/3/4/6/134648043/dawipubek-mekonibetevoju-pegipurida.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386606/normal_5fe60076ba82b.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/fba75f4b-5ddb-4aa2-ba95-482f2d05978e/definition_of_flowchart_in_computer_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bfa7ca6-0f10-4eb9-8191-4be3a641ff58/pajuziliwudegemupevalet.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/chinese_tv_series_sites.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/21420349706.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/soul_movie_player_app.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_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 5076 bytes
SHA-256: 93c40b5a154fd4f4727abc8d4803875994d11635f0e3d84563f2206e3970d1e1
font_01_sfnt_off0001072d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072D 13424 bytes
SHA-256: 1b1cf12a620e3a64010d04182f41fad249320fffa341ed053086dcd03ae5fb54