Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca61f270e3d6a2c6…

MALICIOUS

PDF

78.8 KB Created: 2021-06-10 17:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 37b9711f20a748bbeeb64a2a46968880 SHA-1: e42605ada4922f67de24ecc389d1e6f1ff3d56d3 SHA-256: ca61f270e3d6a2c6b60260e5c553d8bf7fe3116e6fd6cbf7060ffc609eef82d8
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/pbw?utm_term=hangover+movie+full+movie+2009+tamil+dubbed PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474218/normal_5fe28ff173340.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376602/normal_601a74a23232d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457881/normal_5fced3be78cfb.pdfIn PDF document text
    • https://jazewaxuk.weebly.com/uploads/1/3/4/3/134357124/5038378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416332/normal_6027b1b41a96e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406456/normal_5fcc9b11d44c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501965/normal_5fcdf2dfab252.pdfIn PDF document text
    • https://ladifibefumuxuw.weebly.com/uploads/1/3/4/3/134353250/4958324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454287/normal_605c19964b124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476596/normal_603c570b82eb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370744/normal_5ffda87b1fcc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475570/normal_600d62b63ff1f.pdfIn PDF document text
    • https://roxomikanu.weebly.com/uploads/1/3/0/8/130873860/xelazaxofibilejagu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404103/normal_6037887cdc201.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384649/normal_60687609e3b03.pdfIn PDF document text
    • https://nugaruxiboxora.weebly.com/uploads/1/3/0/7/130738781/fifilaf_nejarela_zegek_vesaxojo.pdfIn PDF document text
    • https://vasogumodi.weebly.com/uploads/1/3/4/5/134593232/650aa3f7965be8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453740/normal_60c16fac3b380.pdfIn PDF document text
    • https://xizanubafawadug.weebly.com/uploads/1/3/4/3/134321303/lawijuzepewuvazozuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485318/normal_5fe6a82737814.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464539/normal_5ffaafae6b455.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000de4a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDE4A 14080 bytes
SHA-256: aa660b3f47a5ff0002acecbfc7a1835feaeadcdb564ce105978e751477adb6e3
font_00_sfnt_off0000cb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB31 5640 bytes
SHA-256: 115b76e4a2118b9304b33b67657855348f8e3ebd7c8385f76c598f843d311be5
font_02_sfnt_off0001001e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001E 2572 bytes
SHA-256: 3bcd98d3a5eaff040f0fff44fcce2bf0d36ee5f09c10293edeefef7b9bc92b53
font_03_sfnt_off00010b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B63 9848 bytes
SHA-256: a522192bf8743a4f44252d1f52ed8413725e825b641fd3db2e7797cb33986acc

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