Malicious PDF — malware analysis report

Static analysis result for SHA-256 c748f12e972a5a36…

MALICIOUS

PDF

80.5 KB Created: 2021-02-25 23:45:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3d36267ba9878b097b7cd7ef28d58cf1 SHA-1: 07d69747a497a95e6ffcd4ed8c5018f01bba86c4 SHA-256: c748f12e972a5a3613c46a546917838298386016756f11c3016b7e168e31a162
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many pointing to SEO-optimized content, and one specific redirector URL. This suggests a tactic to manipulate search engine results or to phish users by directing them to potentially malicious sites. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://leonvi.ru/strik?utm_term=nacirema+body+ritual+examples PDF link annotation
    • https://cdn.sqhk.co/natokaze/i1giujh/simcity_buildit_cheats.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470830/normal_5fcfec20b3ee5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426558/normal_5fe2b7b591186.pdfIn PDF document text
    • https://cdn.sqhk.co/lirisakaxam/hjqGhbZ/dinos_online_mod_menu_2019.pdfIn PDF document text
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/1599037.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486565/normal_5ff9acaf3288d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370275/normal_602e127f743ae.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/RZifhck/92897218428.pdfIn PDF document text
    • https://cdn.sqhk.co/zolulesar/nifNihy/geometry_dash_subzero_mod_menu_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/XSAjjuL/jugibinawomas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393632/normal_6037b0728b1be.pdfIn PDF document text
    • https://cdn.sqhk.co/sowodopevew/dIgiiiU/bosozewaxe.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/fumiposamisur/love_message_app.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/can_loose_tea_expire.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/61613312464.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/mamevej.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/54276233985.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/baroque_fonts_free.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/tobufuxapenamop.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10057 5496 bytes
SHA-256: 805f7fb2603f8cd60991a43ecf24a28ec4ea3c4d4821783bdfb8b4ef24c4bc18
font_01_sfnt_off000112fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FA 9836 bytes
SHA-256: ba06d29f65cd00388fda2533fbc918af6e5ce53af334b6c0d710f69ff7b2cd03

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