Malicious PDF — malware analysis report

Static analysis result for SHA-256 c648260e67e75f19…

MALICIOUS

PDF

80.8 KB Created: 2021-05-30 06:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5b0094923624f23a6c273718219f1d66 SHA-1: 9eca1886b6357ca697d1a1a4cf5f57717755e831 SHA-256: c648260e67e75f19cf9d5b3c58afbb371d814ba4e9f04e88c9a0998fd48cd871
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 0.9998

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://nipisod.ru/123?utm_term=bedtime+stories+movie+dual+audio PDF link annotation
    • https://jusunusimonaka.weebly.com/uploads/1/3/4/7/134717465/6760f7effaa395.pdfIn PDF document text
    • https://pelozaxuji.weebly.com/uploads/1/3/2/6/132680784/7633391.pdfIn PDF document text
    • https://mupimafab.weebly.com/uploads/1/3/4/7/134728659/7506862.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388620/normal_5feb59d1cf2a5.pdfIn PDF document text
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/suwaneme.pdfIn PDF document text
    • https://veguxalefimas.weebly.com/uploads/1/3/1/3/131382166/lolop-larazon-dorunu-pakadi.pdfIn PDF document text
    • https://bagugesi.weebly.com/uploads/1/3/0/7/130775983/paxevimet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480905/normal_60329affd198d.pdfIn PDF document text
    • https://vebaxifi.weebly.com/uploads/1/3/4/3/134360040/wedumadibizox.pdfIn PDF document text
    • https://zukugobewumebol.weebly.com/uploads/1/3/4/0/134017275/wepitubolesa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375887/normal_603c3bb175aee.pdfIn PDF document text
    • https://latewumopinigan.weebly.com/uploads/1/3/4/3/134313498/6581292.pdfIn PDF document text
    • https://luxaxila.weebly.com/uploads/1/3/0/8/130814132/sopebusebaral.pdfIn PDF document text
    • https://tujakiko.weebly.com/uploads/1/3/0/8/130814553/3142638.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/360f235c-d6fc-4e94-9eab-ef4831874e54/mizamuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd3ca08f-5715-40ec-b8e3-63d2a5cc33fb/1272169030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04cc4ed8-a113-4106-93f7-5164eb7b7bda/canon_sx160_is_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c110eef-d8ab-48bb-bca7-04822b13f2de/lojitenivezabenomefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5d58fe6-b5dc-498c-ac35-cba291a94ac7/what_motivates_you_to_go_to_school_everyday.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_off0000fe22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 5080 bytes
SHA-256: a06eed27fc4f6f3635da16268a2f05030860a5e190b66af84efb3960a6298ce4
font_01_sfnt_off00010f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 11424 bytes
SHA-256: 2fb5bded7697041f6ba74f75b3543847297d0a41cf94baee19ac32335a5278a4

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