Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b07741c1a2157e…

MALICIOUS

PDF

77.6 KB Created: 2021-02-21 20:58:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 019240863783ced79593610bf12609ed SHA-1: d426c559ea9c1133aee5bb923344a0faa5c7daca SHA-256: a8b07741c1a2157ee3420b281896fd85155d209d455b58d76aa7a5e2809c6445
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the link farm point towards an attempt to lure users to malicious sites.

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://baarspo.ru/wix?keyword=jewel+monopoly+game+end+date+2020 PDF link annotation
    • http://nekretnine.site/garmin_gpsmap_62s_free_maps_downloadbcohy.pdfIn PDF document text
    • http://hookup673.site/que_es_aneuploidiaqrrqz.pdfIn PDF document text
    • http://white-x.fun/pearson_books_downloadfv2bz.pdfIn PDF document text
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/efe6e491.pdfIn PDF document text
    • https://pamaridefudeluz.weebly.com/uploads/1/3/0/7/130776324/xolewesu_mawofeviwukuf_zaxap_xarixumo.pdfIn PDF document text
    • https://gitosupogule.weebly.com/uploads/1/3/2/7/132741155/nutawuxakulosav.pdfIn PDF document text
    • https://xidujodoj.weebly.com/uploads/1/3/1/0/131071067/3803681.pdfIn PDF document text
    • https://tavugalijob.weebly.com/uploads/1/3/1/1/131164394/0479562f8efd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419644/normal_60243cd365799.pdfIn PDF document text
    • https://tukuboxux.weebly.com/uploads/1/3/4/5/134510407/1484966.pdfIn PDF document text
    • http://mafuditovu.iblogger.org/anxit_de_performance_travail.pdfIn PDF document text
    • http://lebolugu.iblogger.org/alien_blackout_android_game_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://molobexe.rf.gd/rudifinumowikuxapup.pdfIn PDF document text
    • http://jeburam.epizy.com/nebewasipasolereripixelo.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/nozunima.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_off0000f425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 5464 bytes
SHA-256: 8fc2d4379943ac7ad8db9da148038025340dedb3f07202651c40c24d41fe9d3b
font_01_sfnt_off000106c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 10172 bytes
SHA-256: 2ff4d9b8da2faf400e537da19a46d3c20a2cb3b6183cebb2ca333b0b03088543

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