Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a7140c29a9bb2a…

MALICIOUS

PDF

84.6 KB Created: 2021-04-21 05:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8760a2192bf63e3960370cb299b4946a SHA-1: 10bb8cf4e43ef7cd13438e8fced888cdca6d9a9b SHA-256: d6a7140c29a9bb2ac15a076b51190a8bb30c69767b07bde732000cbeb6b2113c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to disposable hosting services and employing UTM parameters, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. The embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/strik?utm_term=the+devil+wears+prada+quotes+miranda PDF link annotation
    • https://dujakoxuk.weebly.com/uploads/1/3/1/4/131483447/5dfefa0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_6029608792a6b.pdfIn PDF document text
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/6034034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494677/normal_6031ac1edad10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471109/normal_5ffa424ac6a5e.pdfIn PDF document text
    • https://kokonasaza.weebly.com/uploads/1/3/1/6/131636703/fc1fa38f1485.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/linear_equations_worksheets_grade_7.pdfIn PDF document text
    • https://vejiledulibona.weebly.com/uploads/1/3/4/3/134318828/7482689.pdfIn PDF document text
    • https://nirejabepifu.weebly.com/uploads/1/3/4/2/134266024/c929e8e53956f3.pdfIn PDF document text
    • https://nawikavo.weebly.com/uploads/1/3/0/8/130814462/zezotomofe_rovenovifire_lowisitiloseno_fawese.pdfIn PDF document text
    • https://vogapixafaroge.weebly.com/uploads/1/3/4/2/134234717/a93cef01988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478703/normal_605c6afa5c1a2.pdfIn PDF document text
    • https://dexuwoborusise.weebly.com/uploads/1/3/4/3/134375282/xoxisakomosogow_niduge_fumelenodala.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/jobirogetiluzimanaxu.pdfIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_10fbc3fc1a0e48fa8ced5c893b955762.pdf?index=trueIn PDF document text
    • https://5d55c623-01b0-417f-8131-8dfd0334080c.filesusr.com/ugd/9ef046_74bafcdaee964bdc904b427fa4b591c4.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_2cd7f7e8befb46f888ff7a4cf2ac60a6.pdf?index=trueIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_94783524aabb426e9638bab6786d60be.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/4337866872.pdfIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_1432e7333d7a44aa8a55fcc506e127e0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/94586145035.pdfIn PDF document text
    • http://lanosebezazov.onlinewebshop.net/pidoruvutobibe.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/power_robert_greene_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/local_anaesthesia_in_dentistry.pdfIn PDF document text
    • http://rugoxesoteko.myartsonline.com/bncc_ensino_infantil.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_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 5308 bytes
SHA-256: f91e26797f47953c2fadde99fb782c50f4b30285f39e437ccfd5d8d97bbdba3f
font_01_sfnt_off000110b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 10656 bytes
SHA-256: 592ff6a88d2d2e6042dd96dec4fd2e5fcabea694791922e5bf249213baea1b03
font_02_sfnt_off00013508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13508 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3