Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0df566a277e09c…

MALICIOUS

PDF

79.9 KB Created: 2021-02-28 13:43:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b36294cec4a182f327c235222c1c73d6 SHA-1: 0d62e3d13e97d3c0d228d1dff6aea424de521294 SHA-256: bb0df566a277e09cbfef39917093ee9e47305d5969956086da963a789b59f16b
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The presence of embedded JavaScript, though not fully analyzed here, likely contributes to the malicious functionality by redirecting users to these external sites.

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://zajinet.ru/strik?utm_term=hamilton+beach+roaster+oven+turkey+temp PDF link annotation
    • https://cdn.sqhk.co/xusarukave/cihAdkA/lepixirezasoju.pdfIn PDF document text
    • https://cdn.sqhk.co/susojitigi/hcSM9ig/gikorazejugiwuzudijag.pdfIn PDF document text
    • https://gufekibeliwu.weebly.com/uploads/1/3/1/3/131382841/0b9beff9117e4.pdfIn PDF document text
    • https://cdn.sqhk.co/zixagiko/b0jcTeG/oh_boo_hoo_meme.pdfIn PDF document text
    • https://sinipipa.weebly.com/uploads/1/3/0/8/130874509/5350f2067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408989/normal_600a6f51dab15.pdfIn PDF document text
    • https://leniwexobopusez.weebly.com/uploads/1/3/4/7/134713406/b9ce95e12339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_6030cc7b0126e.pdfIn PDF document text
    • http://bufizuz.22web.org/59044387973.pdfIn PDF document text
    • https://cdn.sqhk.co/jomutepe/Biaigid/pifokemolirirekudoweka.pdfIn PDF document text
    • https://zibinileder.weebly.com/uploads/1/3/4/7/134748255/f832bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380383/normal_5ff622a4ad3d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366406/normal_5fca7ad683f60.pdfIn PDF document text
    • https://cdn.sqhk.co/tejosepu/0gihe40/microsoft_azure_certification_exam_schedule.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/vikewoj.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/challenges_of_implementing_management_information_system.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/al_mulk_rumi.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/xuxiwerimidax.pdfIn PDF document text
    • http://joxowosikaze.rf.gd/pixel_navigation_bar_pro_apk_4._4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 5380 bytes
SHA-256: 7f9ad34aa47a4079b855c8b558ae620b522ea7e671c7c4b3832821912170ce31
font_01_sfnt_off0000fde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE5 11164 bytes
SHA-256: 372f8b1b4c569336980ac9f780dd6008fd3809c0252808979c7385846b60ca5d
font_02_sfnt_off000123c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C4 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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