Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4b1615336b29f7…

MALICIOUS

PDF

104.4 KB Created: 2021-03-03 03:00:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 07211bf7b384e6e629a9fb7a3b2124fe SHA-1: 02339c1e9d926a1127db8cfba0db327b87b16ca9 SHA-256: 6c4b1615336b29f7d6aa2fd46e5a32d757f9f1da4746ba6cb2968666eace168b
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains or link farms, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or malicious content delivery mechanism. While no scripts were directly extracted, the presence of numerous URLs points towards an attempt to lead users to malicious sites, potentially for credential harvesting or further malware delivery.

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://jottigo.ru/award?keyword=the+bands+of+mourning+summary PDF link annotation
    • https://cdn.sqhk.co/remozemot/midgcpt/94706096080.pdfIn PDF document text
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/tadaga_vivozude.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/IiGEthf/xufusi.pdfIn PDF document text
    • https://cdn.sqhk.co/takoxuwal/egjIie7/14035112298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454820/normal_6035c3cc958a0.pdfIn PDF document text
    • https://duzezefoge.weebly.com/uploads/1/3/1/4/131437668/8592557.pdfIn PDF document text
    • https://cdn.sqhk.co/rapekerokemo/fhgiUid/besinowej.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/fQDOjjE/stickman_warriors_super_dragon_ball_hack_apk.pdfIn PDF document text
    • https://vorexumezekadan.weebly.com/uploads/1/3/0/9/130969740/9172223.pdfIn PDF document text
    • http://senenetikoxikom.22web.org/sivunanosiwukit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://temekem.epizy.com/heavy_equipment_rental_rates_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/baahubali_1_movie_tamil_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/mekov.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/sweet_baby_boy_photos.pdfIn PDF document text
    • http://tedijafubivot.epizy.com/90565332228.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_off00015f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F04 5480 bytes
SHA-256: 7451afba1f9c65c786c02d5cb8a54bf216212f46128130f01bdfee3d7e8a5fc2
font_01_sfnt_off00017183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17183 10240 bytes
SHA-256: 6589e0db41e7a06e85cb620c095612c090d7efec9d911392bff745c775d2de64

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