Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09c7a05f1977072…

MALICIOUS

PDF

66.8 KB Created: 2020-12-14 02:01:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1414cf2bfe11ffd7910337e2169a4244 SHA-1: 73a3abd1733a2eccb8af360a407be70b83c0286d SHA-256: a09c7a05f197707240d9cabc0d521422f51e5c86c3f0128e10010244481bd792
156 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 5

  • 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.
  • 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://traffnew.ru/aws?utm_term=bradez+simple+instrumental PDF link annotation
    • https://vozunekoba.weebly.com/uploads/1/3/4/9/134902797/5126444.pdfIn PDF document text
    • https://dewubonate.weebly.com/uploads/1/3/4/4/134466502/e0a5267744e.pdfIn PDF document text
    • https://xanevifoje.weebly.com/uploads/1/3/4/6/134666083/5162703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462980/normal_5fa3391e267ff.pdfIn PDF document text
    • https://kolivobaka.weebly.com/uploads/1/3/4/5/134500933/9683603.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc4da975bcb0228a29bc7b8/t/5fcf14a505f6f27807522299/1607406757533/dawnbreaker_skyrim_quest.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5827fa879396864275a1a/t/5fd02442ef76c20f2d3e1731/1607476290601/89982623949.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e9eb3398ff75152e2002/t/5fcb535633fb14715cb9cd16/1607160665615/syberia_2_plane_crash.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc575ad2bbd740658254770/t/5fd6a101226e9048fac0790e/1607901442146/61992162305.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c28ca5bc066edfa50021/t/5fc4c19f61e25426e1cdff1c/1606730145049/domain_and_range_worksheet_2_answer_key_algebra_1.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc58d09d49dd1244753da13/t/5fc953153151a575cdd25100/1607029527147/cara_cheat_stickman_rope_hero_2.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_off0000c857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC857 5204 bytes
SHA-256: 5a8faabe59efe62b5aec19ef376c31035b1ec843026eb9feb3ce56a470d3cd54
font_01_sfnt_off0000d9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F7 10944 bytes
SHA-256: 2ada8b9f25862ec6a7316a522a0e2344d00401150ef9f13c00f618a81296ac5f

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