Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb1d3bcc137930d…

MALICIOUS

PDF

76.8 KB Created: 2021-03-12 20:52:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 271c7712b4ad767811df640ce2047644 SHA-1: 9e5cf00b2e60182690cd2573bd32ec24e8dbb162 SHA-256: dcb1d3bcc137930d417cd7c8564a4328e557d5a58af5094524878469ef11e3c9
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that point to other PDF files, likely for SEO manipulation or to distribute further malicious content. The presence of multiple external links on disposable hosting suggests a phishing or spamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/wix?keyword=the+warrior+heir+cinda+williams+chima+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455672/normal_6006f154a2367.pdfIn PDF document text
    • http://vnds-v.website/6664099541ywrzc.pdfIn PDF document text
    • https://cdn.sqhk.co/sofetarunox/SkqhcWz/xibila.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/3jigdHg/sibotoligel.pdfIn PDF document text
    • http://labiosdewonda.com/sparklebox_letter_formation_glvza3.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/iie6jik/kaxalewanirinas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470533/normal_5fe5995c30a61.pdfIn PDF document text
    • http://itsamorem.com/31174340051lzgsg.pdfIn PDF document text
    • https://cdn.sqhk.co/detatakev/hgCjjcF/31355310028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475389/normal_5fd15b5307a3a.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/jeiahbz/xewavejepevozomivelafika.pdfIn PDF document text
    • https://cdn.sqhk.co/fazejitev/8WRif0Z/ditibikajigabo.pdfIn PDF document text
    • http://evatopshop.xyz/bible_esvfiwqg.pdfIn PDF document text
    • http://bestsaleshopin.xyz/2083934095779gdf.pdfIn PDF document text
    • https://cdn.sqhk.co/jalosemuv/jhUtPgk/ielts_speaking_part_1_answer_length.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443576/normal_5ff16c8702f75.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/a4b32d18-df44-4265-9e75-a45f216756f2/vegumamubexatasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbcd1fe6-35c0-40c8-876a-1f14f33b9a9f/is_evening_primrose_oil_good_for_skin_and_hair.pdfIn PDF document text
    • https://5e86d2bf-4ad8-496a-9e8d-bde47e9cd161.filesusr.com/ugd/b56239_e748b8380ed64e5b97c60eed4b2a95eb.pdf?index=trueIn PDF document text
    • https://8035c368-62b5-4e0f-b07c-73fd2baf85c9.filesusr.com/ugd/2ee8d4_9a0afb02641f4092bbe55407d7a54d5f.pdf?index=trueIn 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_off0000ef66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 5436 bytes
SHA-256: 420020a5d648a4f10f89b14450fb27a6aff0b51d70799679fef4e93759d93142
font_01_sfnt_off000101c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C5 10520 bytes
SHA-256: 004ae27a6f378ff0a048774c30a5a5efb56884350affa10e22c765208d45c8d6

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