Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ccb7b49fac8d373…

MALICIOUS

PDF

71.9 KB Created: 2021-02-28 15:46:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9d8cae28615ad95c25c95d256e3b2fda SHA-1: 9e2ebd75758ea4519367b0b042c8af76a0a6fca3 SHA-256: 6ccb7b49fac8d3730961f3361ce3b8121501700826d97b57c19a3f318629fbd0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and employing UTM parameters, indicative of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm characteristics point towards an attempt to redirect users to malicious content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=how+to+clean+a+salt+chlorinator+cell PDF link annotation
    • https://cdn.sqhk.co/zakoduba/Y620hiO/riponoxudevafebuna.pdfIn PDF document text
    • http://homearfes.com/enrique_iglesias_bailando7b6vk.pdfIn PDF document text
    • https://doxuginuf.weebly.com/uploads/1/3/5/3/135346615/5476780.pdfIn PDF document text
    • http://crysety.xyz/mathbits_com_ah_bachbjpo6.pdfIn PDF document text
    • http://creditscoreusa.info/top_safety_rated_infant_car_seats_20193bf4a.pdfIn PDF document text
    • https://cdn.sqhk.co/bidubuwawi/lbhhhcC/nijozijawosififomaniji.pdfIn PDF document text
    • https://cdn.sqhk.co/vufebevefo/c7hh4gi/zififolisimonukel.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/ibMggjh/snake_in_the_grass_odyssey_bug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469836/normal_60134625bdd40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528876/normal_5fe0a87e615b5.pdfIn PDF document text
    • https://cdn.sqhk.co/motulobugaji/iW0Y1ji/9327787452.pdfIn PDF document text
    • http://larts.digital/2015_junior_miss_pageant_nudist_contest3cxwo.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/dojivewobasuval/23588655882.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/94015447284.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/whatsapp_animated_status_video_song_tamil.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_off0000de7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7E 4940 bytes
SHA-256: b43889b0dae63d6f790a2a78fe3ea6a088220b37a1a5a370f505c83315de36c0
font_01_sfnt_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 10348 bytes
SHA-256: 5ffa3976b4394218652db4e6a106abd01562e601e6a23d39524c2222511bc02a

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