Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56b698302f6d10f…

MALICIOUS

PDF

91.8 KB Created: 2021-03-05 13:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e8f3b0be1f5e5a2ec8124b6a32a7c8f0 SHA-1: 330fc605a5487bd6cd0f2c55b18452d7c34695a0 SHA-256: b56b698302f6d10f237b47ca42dca6691a0989edf2f7c47f202789de0d0c2000
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URLs, many pointing to disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The document body, though partially corrupted, includes keywords related to book downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/wix?keyword=the+years+of+rice+and+salt+pdf+download PDF link annotation
    • https://cdn.sqhk.co/bipozipo/rkjfQhb/42855557244.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/sjbjdja/58827177416.pdfIn PDF document text
    • http://letuxegesilem.iblogger.org/2019_calendar_malayalam_deepika.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/fCxnhg6/battle_sound_effects.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417670/normal_6031452a64558.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/jhihBha/13348379172.pdfIn PDF document text
    • https://basosogufu.weebly.com/uploads/1/3/4/6/134682995/7211779.pdfIn PDF document text
    • https://podogavefa.weebly.com/uploads/1/3/1/4/131438056/kudikabivodopu.pdfIn PDF document text
    • http://verezitabel.66ghz.com/celulares_android_baratos_telcel.pdfIn PDF document text
    • https://cdn.sqhk.co/dabebasavus/jbeifoq/69235402579.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497110/normal_5fcbf79ed670c.pdfIn PDF document text
    • https://gopopozemilin.weebly.com/uploads/1/3/0/8/130874381/kariw.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/8rihzxg/thief_master_phone_game.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/tolivajupeku/wudilijitofop.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/how_to_use_monat_oil.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/4._3_distinguishing_among_atoms_answers.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_off00012cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB3 5384 bytes
SHA-256: 91632743ba4ec8bedc051cffba3aa6b05e6e1ef65c55f9ba30369846c47cff3e
font_01_sfnt_off00013f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F17 10180 bytes
SHA-256: 278c494fd509245d4c5e89be19c13003389991421aff81dde3b879fdbcd44a6f

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