Malicious PDF — malware analysis report

Static analysis result for SHA-256 def734bcdaa87072…

MALICIOUS

PDF

65.6 KB Created: 2021-02-11 15:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f4a908fe896ddea445445dfad1e526ea SHA-1: d2efdbdc3b23cadc9008ef4e018695357cb47416 SHA-256: def734bcdaa87072169d02401430e364efd9d37f772a33ff1b702aa4f0f169f1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various PDF files hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and numerous external links are highly suspicious.

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://baarspo.ru/wix?keyword=what%2527s+after+millionths PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485004/normal_600ac67e342eb.pdfIn PDF document text
    • https://cdn.sqhk.co/xedaberetaj/hgXjdKn/varagijal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371013/normal_6007ea2246431.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427501/normal_5ffa71393f05d.pdfIn PDF document text
    • https://muragifenujokuf.weebly.com/uploads/1/3/1/1/131164382/5033129.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/2cl3Wn6/ruxuze.pdfIn PDF document text
    • https://marikiwow.weebly.com/uploads/1/3/1/3/131379510/rarezum.pdfIn PDF document text
    • https://lugijuvumefabi.weebly.com/uploads/1/3/4/7/134761930/fozarezalir-zosorixade-lotola-dagazikafa.pdfIn PDF document text
    • https://xuwupeloz.weebly.com/uploads/1/3/4/7/134734270/16eea.pdfIn PDF document text
    • https://legorigerelok.weebly.com/uploads/1/3/6/0/136056749/vatekix-nejekezub-gajozutusev-pabafizodeved.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450632/normal_601794a6ac672.pdfIn PDF document text
    • https://pudabesipewoz.weebly.com/uploads/1/3/0/9/130969441/nalipusejinus.pdfIn PDF document text
    • https://fefokivaz.weebly.com/uploads/1/3/0/7/130776727/xajazumoz.pdfIn PDF document text
    • https://cdn.sqhk.co/safimowexaw/fgdjcsu/retro_game_collector_heaven.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/jhMifhh/celebrity_voice_changer_app_price.pdfIn PDF document text
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/tixowagowiz-lanijega.pdfIn PDF document text
    • https://cdn.sqhk.co/razefudixid/XvOnDtK/panixeloxuzuzepo.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/zunaporam/breakup_diary_images_hd.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37D 5056 bytes
SHA-256: a9c6939a45518d440968212fe815fe738a65bca4bb4eb0ad0d4cd989f181b76a
font_01_sfnt_off0000d493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD493 10896 bytes
SHA-256: 98f584173de3b66d2cfc5844bca760a0e98ba3e171cf0f78afff23b6208fe9a9

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