Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b60c76da76c6ab7…

MALICIOUS

PDF

80.7 KB Created: 2021-01-11 19:04:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0e86e1c131abff5d5b93fb07eb523cfe SHA-1: 7c9bfd46be4690fc85815dac2efd9b4eb57683da SHA-256: 9b60c76da76c6ab7450088eecac1340911ca3845b7bd475836f79b3688a75a76
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various PDF documents hosted on disposable domains, a common technique for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=angle+of+insolation+lab+answers PDF link annotation
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/wavavomewa.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/nadolekiv.pdfIn PDF document text
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/5270422.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368245/normal_5fc7d2b0552fd.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/4994791.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/jfhhgcQ/cross_stitch_monogram_patterns.pdfIn PDF document text
    • https://nubavusixid.weebly.com/uploads/1/3/5/3/135348304/e14db2622f4cb9.pdfIn PDF document text
    • https://zunodeni.weebly.com/uploads/1/3/1/0/131070331/2d02ee1edb.pdfIn PDF document text
    • https://cdn.sqhk.co/pugalaleluti/mhhoidp/general_motors_arlington_phone_number.pdfIn PDF document text
    • https://saxejuwujare.weebly.com/uploads/1/3/4/4/134448786/3144255.pdfIn PDF document text
    • https://wodanosivowifig.weebly.com/uploads/1/3/4/5/134593279/809532270b14ae7.pdfIn PDF document text
    • https://woronawupewusor.weebly.com/uploads/1/3/4/6/134672267/wofinonevazo.pdfIn PDF document text
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/7a37a8e7ad5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422897/normal_5fdc46e297792.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nalifij/bad_time_simulator_apk.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F5 5156 bytes
SHA-256: 63caff9aa3d6d827f688ef4c97dd3bd3d8f778ce565961a0f2a32e369cebcfd1
font_01_sfnt_off0000faaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAA 11180 bytes
SHA-256: 41bb25c2182ae6ae1cf82611753dc14f8f56077a7e9c4903a092f2e3dd610a50
font_02_sfnt_off000120f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F6 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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