Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de408552143edf7…

MALICIOUS

PDF

92.4 KB Created: 2021-03-18 18:02:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b3a421be8201db4d2f4248d7db100171 SHA-1: 8ac46451f3d4eb552303afdf36388599e4be0a10 SHA-256: 1de408552143edf772dab2d2f5345b97e2632ae11251b415a1aa0e19266a6052
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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://maypoin.ru/wix?keyword=aetherial+reduction+rotation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488822/normal_600e653f35451.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/hejbjaw/77452099712.pdfIn PDF document text
    • http://nunobuzipame.medianewsonline.com/the_riveras_season_1_full_episodes.pdfIn PDF document text
    • http://jomekiziwe.22web.org/60272104451.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490516/normal_5fde0dc08559f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413846/normal_5fcb10b090181.pdfIn PDF document text
    • https://metatigizedi.weebly.com/uploads/1/3/1/3/131398099/4816204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_604a3ae4e6db7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408718/normal_601a13b8066c1.pdfIn PDF document text
    • https://cdn.sqhk.co/puberufibo/tiiRYgj/fnaf_amino_espanol_apk.pdfIn PDF document text
    • https://fuwiposodunumof.weebly.com/uploads/1/3/1/4/131438128/jufopego_muwozemef_wojiri_wiwisofubik.pdfIn PDF document text
    • https://kopezufotixese.weebly.com/uploads/1/3/1/1/131164020/e774e57b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450625/normal_60244e23caa58.pdfIn PDF document text
    • http://wedasuf.getenjoyment.net/star_trek_enterprise_season_2_episode_4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381752/normal_5ff55287f12d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502236/normal_6052809791ef9.pdfIn PDF document text
    • https://cdn.sqhk.co/mosikojilat/0idRGhh/32160866662.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/67720576301.pdfIn PDF document text
    • https://cdn.sqhk.co/najuvotuwoz/0hhZIjg/metal_mail_drop_box.pdfIn PDF document text
    • https://cdn.sqhk.co/limexofure/cZmgw0m/gavejifetupezivibuxidav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bigisokuwes.epizy.com/33135040506.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_off00012c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3B 4840 bytes
SHA-256: cb934364d43dc0e12d3c1f62c4841d7a81a65e946831195098cd7ed8a10d5ba6
font_01_sfnt_off00013ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA0 11768 bytes
SHA-256: d4354d19af6098a73944480f432ed2c14afb01f65f030664636056802aaeca12

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