Malicious PDF — malware analysis report

Static analysis result for SHA-256 388437f8eff42046…

MALICIOUS

PDF

94.2 KB Created: 2021-03-02 00:44:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 28ed61b6418cb7e8231ce0b1a155291c SHA-1: fce83b9401b8a922c4c8559e154725b5bd0db72e SHA-256: 388437f8eff4204679c7668b31f40ebba06203d975d17294d641db9bdb9ea9b3
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://baarspo.ru/wix?keyword=magic+school+bus+getting+energized+worksheet+answer+key PDF link annotation
    • https://xobijuveja.weebly.com/uploads/1/3/1/6/131606615/zopapofepurexuwe.pdfIn PDF document text
    • http://fixmarker.fun/In PDF document text
    • https://static.s123-cdn-static.com/uploads/4488101/normal_5fd08d94cc3b6.pdfIn PDF document text
    • http://mxbur.fun/setivegawuye50.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/cjchggi/lycamobile_top_up_shop_near_me.pdfIn PDF document text
    • http://badge-verification-center.com/65898961203e9kpj.pdfIn PDF document text
    • http://regvoolkim.website/masokonuwapibylxa.pdfIn PDF document text
    • https://posajegodat.weebly.com/uploads/1/3/4/4/134477503/69b8a8cb613.pdfIn PDF document text
    • https://cdn.sqhk.co/vifamepupib/WZjcjA7/king_herod_s_death_by_worms.pdfIn PDF document text
    • http://sodaapp.pro/one_piece_gigant_battle_3_apk8azcj.pdfIn PDF document text
    • http://accueilcmb.com/cuckoo_rice_cooker_user_manualv3x0f.pdfIn PDF document text
    • https://cdn.sqhk.co/pepegizeso/ghid1gc/33068806365.pdfIn PDF document text
    • https://ranalugepileli.weebly.com/uploads/1/3/4/7/134735155/9875915.pdfIn PDF document text
    • https://cdn.sqhk.co/nugofonavuf/qaz9Yic/tupodemogidogunulabe.pdfIn PDF document text
    • https://cdn.sqhk.co/fopalixogul/vgjhgib/50644167435.pdfIn 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
    • 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_off00011168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11168 2828 bytes
SHA-256: 85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f
font_01_sfnt_off00011b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B62 5652 bytes
SHA-256: 333c8d6c468e83a4eb92f14c720c1623ec25ce7ce34cc63dc9825ebe267a68e8
font_02_sfnt_off00012ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC3 11440 bytes
SHA-256: 71f0de0f61487289168e656bc3b5a0de017b8d1cf5c2306e30037f1366557286
font_03_sfnt_off00015576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15576 16064 bytes
SHA-256: 723e6034cfa8adeebabcb44fcd9a81d05c7492831ad3e7dd1a7a87e114838b67

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