Malicious PDF — malware analysis report

Static analysis result for SHA-256 effc81ec61639c63…

MALICIOUS

PDF

69.4 KB Created: 2021-03-11 08:36:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 00213a78cf09a9a12c941a1d94056dc8 SHA-1: bbf2ff0350ed1bf353797441b89a0d1f337f2294 SHA-256: effc81ec61639c63d50e4bb89d85db46b8cd1bae5233f97e99cac656ae146c75
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a malicious URL. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

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
  • 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://xezojetit.ru/strik?utm_term=introduction+to+medical+terminology+textbook+answers PDF link annotation
    • http://raicen.com/65970163737xs9lp.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/hdicija/brandy_piano_man_az_lyrics.pdfIn PDF document text
    • http://leafester.online/fubebufotejotkx1j.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/r1yz0hb/cheat_for_among_us_guide_map.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416327/normal_603d4e54a4ae2.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/ggkhgge/magic_tiles_3_commercial.pdfIn PDF document text
    • https://cdn.sqhk.co/lexebogefaj/4SWnUgc/96637013515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409413/normal_5fd7c20fd0dd3.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/jhHehi6/bubble_tea_popcorn_tong_garden.pdfIn PDF document text
    • http://savadaqwe.space/79821292835ca77y.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuzadisup/Shaiagc/shifty_jelly_pocket_casts.pdfIn PDF document text
    • http://erkutungotu.com/rotosalimediriwijefe095f.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/Akjebjd/xekelutinusisujub.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/xazarujokemus/what_is_the_topic_of_little_red_riding_hood.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/abide_with_me_lyrics_and_sheet_music.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_off0000cf93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF93 5660 bytes
SHA-256: 3edcbc770c10ba219e2e4eae00ac5a0de8ef19eb8940b54c1dbae75c7a3c4257
font_01_sfnt_off0000e2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D8 10604 bytes
SHA-256: 2be302d3addeedef007df721930e0d21b1dd7040254cc9a2d4c03e7eb5118972

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