Malicious PDF — malware analysis report

Static analysis result for SHA-256 512fc6211b89ac1b…

MALICIOUS

PDF

82.1 KB Created: 2021-02-28 14:26:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: acce31bcab106ec8c2504399708aec5c SHA-1: 0e3653f1d81372a06ca9d5435488de6a6cec2121 SHA-256: 512fc6211b89ac1bf07f73296ff0fe7c699d6292a297a1f5663813aedb43f545
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 0.9996

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.
  • 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://golowaki.ru/wix?keyword=apk+mario+bros+all+star PDF link annotation
    • https://cdn.sqhk.co/zenegiwowi/fgjiij7/35531932141.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496602/normal_60072947ee28b.pdfIn PDF document text
    • http://wotaxatumumodok.sportsontheweb.net/house_drum_beat_ableton.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481699/normal_6008048fd4e70.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutesilo/hbIE7ja/44347896884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_60248c54d43b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450898/normal_5fc8eba7d2c70.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/9ifjgja/23238607852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393356/normal_600e3500cb7fc.pdfIn PDF document text
    • https://cdn.sqhk.co/wesebewoweva/izPwyzC/82270829981.pdfIn PDF document text
    • https://duloduwo.weebly.com/uploads/1/3/4/8/134850843/maxidumedupud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bifovigavij.myartsonline.com/vutesugi.pdfIn PDF document text
    • http://jizipok.rf.gd/canonical_form_meaning_example.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/affidavit_of_support_form_pcg_dubai.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/bang_bang_song_jessie_j_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/dubbed_anime_reddit.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AE 2964 bytes
SHA-256: 1ed65669c15e6d5687e28e439fd34ce89cc83a01f0828cf67deea706709d3b91
font_01_sfnt_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 5160 bytes
SHA-256: 9ebdc576b8f40af6228e05742da321eb014289efa796ea21ae7db1d33e0125a7
font_02_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 12748 bytes
SHA-256: 65953bc86669c9c7cc1e86194cf9f5a2b684fa379e8323cca529ed7329bb8215
font_03_sfnt_off000125d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D0 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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