Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c49a0863cb9f3e…

MALICIOUS

PDF

72.1 KB Created: 2021-02-27 10:30:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cb49e710390898ac87669cf5ad77d7aa SHA-1: 5bcdb2aa5ae162ca8167b9838d6a78fbcd9c4258 SHA-256: 70c49a0863cb9f3e8269784236ec70949a63bd01c384de2820ded3178962e8c9
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection confirm the malicious nature of the PDF. While no scripts were explicitly extracted, the nature of link farms often involves JavaScript for redirection or obfuscation, hence T1059.007 is included as a likely component.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/award?keyword=which+model+of+omron+bp+monitor+is+best PDF link annotation
    • https://cdn.sqhk.co/sovajepuxe/jejh1Dl/jepipujelepu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467273/normal_5fde4c1bc310d.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/what_were_the_terms_of_the_treaty_of_fort_laramie_1868.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/levewoboxidematusekibuwes.pdfIn PDF document text
    • https://xaxibilezulaf.weebly.com/uploads/1/3/4/0/134096047/jukazibu.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/hdihyib/superhero_glitter_coloring_book_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485440/normal_601a7d7b2026d.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/gEhbfij/tepebagerojowi.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/acer_aspire_3_replacement_charger.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/djbgfDr/bloons_tower_defense_6_apk_mod.pdfIn PDF document text
    • https://ruxibudowivuk.weebly.com/uploads/1/3/4/7/134728491/4072005.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370533/normal_602b2a6a3f88d.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/zarevizebi/halo_beyonce_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/50493812389.pdfIn PDF document text
    • http://suvowafavij.epizy.com/global_platform_as_a_service_market.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/clapton_wire_guide.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_off0000dddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDB 5340 bytes
SHA-256: 9cfea9a4e311369378337bd48107c9d38f985f0dc06509aa5919b16e7e808381
font_01_sfnt_off0000efe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 10296 bytes
SHA-256: b00a655e9fb3315fa8f7a2dd960922fa56e1ea11cd52a4c484cb478635481b6c

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