Malicious PDF — malware analysis report

Static analysis result for SHA-256 44dfbbc45bff14d5…

MALICIOUS

PDF

70.6 KB Created: 2021-05-18 08:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c30c641ff5539291b83c279f9981f52b SHA-1: b385d1a6770e4bd8736ea24286acb3d9cedc4542 SHA-256: 44dfbbc45bff14d5617bf471295a31ade1b1acfd17c7ad099c6d15ddce940062
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://bologen.ru/strik?utm_term=cursive+handwriting+practice+year+1 PDF link annotation
    • http://duzatizej.iblogger.org/14083818776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_602d459759d99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416798/normal_6062779a8a298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_6013e92650a64.pdfIn PDF document text
    • http://tasefuvakol.22web.org/sol_marksheet_ba_programme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_60245cd4700bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505326/normal_5fe827a579d81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424996/normal_60562f30eda3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401971/normal_5fc5bc3723fa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390081/normal_60469b5d9d8c7.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://uploads.strikinglycdn.com/files/e0cb6068-5b82-4d15-a9e8-f7ff171d6375/yard_machine_chipper_shredder_10_hp_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3daafb8e-fc22-4689-9dd6-a2851217ffd8/what_is_4_ezra.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/44924735775.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/dumbarton_reporter_newspaper.pdfIn PDF document text
    • http://favukimasinete.rf.gd/runufovaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/879a381b-59f4-49a7-80e7-fc6a49c8534d/96767130703.pdfIn PDF document text
    • http://juvojifexuf.epizy.com/meraratebebit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7926d007-df59-4473-937e-2a4ad7cee64b/causal_chain_analysis_example.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/bodokopu.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/79584492618.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/kowamexojudipudadamafajo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA05 5404 bytes
SHA-256: 2e6296413c2c13ba963e9f7a66cf6ede13a34b559e63406aeea00905284f21b1
font_01_sfnt_off0000dc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC83 10060 bytes
SHA-256: b7a80b9e8b2bff44f360944398d8e7aa5602e846d8defc0a224b1759d34debd7
font_02_sfnt_off0000fef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF2 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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