Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bc297d4f55eb70…

MALICIOUS

PDF

78.0 KB Created: 2021-05-31 23:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b81eb0c1ba253e2d59783c47aede521 SHA-1: b890a2fdc213f9a6975cc07127e9cf6e5b30987f SHA-256: 18bc297d4f55eb70afab62b6dc3e8ae7337644f5581ecd59315f8405a9c2cea7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The primary URL, 'https://pixomot.ru/pbw?utm_term=how+to+do+a+hard+reset+on+my+acer+laptop', is presented as a helpful guide but likely serves as a lure to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/pbw?utm_term=how+to+do+a+hard+reset+on+my+acer+laptop
    • https://cdn-cms.f-static.net/uploads/4409614/normal_6028674ed8160.pdf
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5fd7d28fb0337.pdf
    • https://cdn-cms.f-static.net/uploads/4455883/normal_6046735024c0b.pdf
    • https://cdn-cms.f-static.net/uploads/4392441/normal_603892e189403.pdf
    • https://static.s123-cdn-static.com/uploads/4486982/normal_5fe2c947a5900.pdf
    • https://cdn-cms.f-static.net/uploads/4479439/normal_6052863cf19fd.pdf
    • https://divuvefa.weebly.com/uploads/1/3/4/7/134759037/9724129.pdf
    • https://pazodozonevaken.weebly.com/uploads/1/3/4/6/134606284/fugukozivaw.pdf
    • https://mosuvixixe.weebly.com/uploads/1/3/0/9/130969854/6d41fa0.pdf
    • https://negogesi.weebly.com/uploads/1/3/0/7/130739616/wolusu_sipij_mezigudebal_sufetuto.pdf
    • https://gubotejulide.weebly.com/uploads/1/3/4/3/134380330/8263455.pdf
    • https://static.s123-cdn-static.com/uploads/4366984/normal_6001df0d90e94.pdf
    • https://cdn-cms.f-static.net/uploads/4497110/normal_6050d965b8163.pdf
    • https://basoxafal.weebly.com/uploads/1/3/4/4/134499196/puravuzoju-lemoken-fijenu-dewegumimozekut.pdf
    • https://cdn-cms.f-static.net/uploads/4452853/normal_606a80bdd90a1.pdf
    • https://cdn-cms.f-static.net/uploads/4426090/normal_5fe7a1948ecdf.pdf
    • https://matazesugol.weebly.com/uploads/1/3/4/7/134702103/2b764.pdf
    • https://wogaxorabamogak.weebly.com/uploads/1/3/4/4/134400234/barolu.pdf
    • https://cdn-cms.f-static.net/uploads/4370540/normal_601aeafe65b94.pdf
    • https://static.s123-cdn-static.com/uploads/4369930/normal_5fe3205a3046e.pdf
    • https://cdn-cms.f-static.net/uploads/4501479/normal_60584e8a473a3.pdf
    • https://kutadaboveg.weebly.com/uploads/1/3/0/7/130738989/gonenugak.pdf
    • https://static.s123-cdn-static-d.com/uploads/4420028/normal_60afed91d5253.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wiwedano.pbworks.com/w/file/fetch/144425505/rogaluzirelowekobipevemo.pdf
    • http://jajisaparev.pbworks.com/f/vifulixekodoratatizi.pdf
    • http://funinupun.pbworks.com/w/file/fetch/144422439/pimawovunipiwuwi.pdf
    • http://lekipirunezi.pbworks.com/f/88128310229.pdf
    • http://kedetuwi.pbworks.com/w/file/fetch/144419811/33950624282.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f144.bin
f8a04df7085071de3a93814e217a2cc3dc36c1bdb5a4ea0b337cfb9f5f382f34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 5468 bytes
font_01_sfnt_off000103c4.bin
43394c8cc7788791558e5b13bfa93514e92553ad7a73ade6e3a0b310b516ad78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103C4 10640 bytes

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