Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a4461275d27369…

MALICIOUS

PDF

89.4 KB Created: 2021-05-13 02:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4f4c77bd0e7d6b2a7531ad5992ecf7f6 SHA-1: 9113b9cea49e0a4de184db85cbb590835e9ad0e5 SHA-256: 76a4461275d27369d2eb02e303e964cf78edae535cded5792a0696a3851f2495
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://nipisod.ru/strik?utm_term=how+do+i+stop+my+fire+alarm+beeping+every+30+seconds PDF link annotation
    • http://masalev.ru/holt_sociology_textbook_answersbhssl.pdfIn PDF document text
    • http://repair-foto.ru/673801043496x78l.pdfIn PDF document text
    • http://bitcoinov.site/65303389340myjgl.pdfIn PDF document text
    • http://tiktokhd.design/4.3_l_mercruiser_engine_oil_filterye3zo.pdfIn PDF document text
    • https://daniwevuwawudo.weebly.com/uploads/1/3/4/8/134849628/141630.pdfIn PDF document text
    • https://xirabefutabo.weebly.com/uploads/1/3/5/3/135323672/75936ca1.pdfIn PDF document text
    • https://zakekeru.weebly.com/uploads/1/3/4/5/134584110/8709885.pdfIn PDF document text
    • https://juxeduwabup.weebly.com/uploads/1/3/0/7/130775558/topuzo.pdfIn PDF document text
    • https://dipalowijoje.weebly.com/uploads/1/3/0/9/130969855/e04b5f.pdfIn PDF document text
    • http://converstarget.ru/30030894322aqfku.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/25010148266.pdfIn PDF document text
    • https://zirakamu.weebly.com/uploads/1/3/1/3/131398357/4789104.pdfIn PDF document text
    • https://kamobukumigudeg.weebly.com/uploads/1/3/1/0/131069934/ce7ce.pdfIn PDF document text
    • https://kokilanoru.weebly.com/uploads/1/3/4/0/134012510/xidebuleku.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://uploads.strikinglycdn.com/files/6ca9f275-e298-4fa3-bfe5-deec29d0ea14/grohe_kitchen_faucet_sprayer_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/207d1bb9-3356-47f4-921f-f2ddf9930263/dyson_dc16_charger_voltage.pdfIn PDF document text
    • http://pezefaxovojole.atwebpages.com/zedadesabutosovamisatin.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/personal_branding.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001105a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105A 5924 bytes
SHA-256: 6be00967126eb208cbf5d913a4bb6d2b001079a07c625a15ec22cb927cba9447
font_01_sfnt_off00012485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12485 10924 bytes
SHA-256: 19d2eb9805cf7738fe52ed117e4b21c22d69be00ba2432d991051b008f07cabe
font_02_sfnt_off000149a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149A8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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