Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ac9d8890e70139…

MALICIOUS

PDF

75.7 KB Created: 2021-03-27 10:20:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2d16557469dd3096b5faa50dbbd3da1d SHA-1: 90aa25a6f0b6278771c1e154d1b71de0636cd5a2 SHA-256: f6ac9d8890e701390e10ebd79d24d668909a70b318a4cefc092a5633c336a80e
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 0.9998

Heuristics 5

  • 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 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=livre+aviculture+pdf PDF link annotation
    • http://natiral.space/how_to_reset_a_dewalt_20v_batterydcvip.pdfIn PDF document text
    • http://nesobaka3.xyz/gre_quantitative_hard_questionsyk8ge.pdfIn PDF document text
    • https://lupipoga.weebly.com/uploads/1/3/4/4/134402738/7623174.pdfIn PDF document text
    • https://jukaregexiw.weebly.com/uploads/1/3/2/8/132816195/6757005.pdfIn PDF document text
    • https://fofifiso.weebly.com/uploads/1/3/4/6/134613093/1814326.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390664/normal_5fdcbd27d4e73.pdfIn PDF document text
    • http://premium-cinema.com/blood_bowl_2_codesz8cm6.pdfIn PDF document text
    • https://tulofezufiruz.weebly.com/uploads/1/3/1/4/131409090/waketatukoba.pdfIn PDF document text
    • https://rajezedej.weebly.com/uploads/1/3/2/6/132682549/3180868.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454575/normal_6001d5aeaa6e2.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/zepifudoxapo/snowbasin_ski_report.pdfIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_95149a5e715a4a02b92f6822c2818a90.pdf?index=trueIn PDF document text
    • https://02aee961-309f-4c8b-9790-08f12c26706e.filesusr.com/ugd/8321db_af7252c225c740fda0c28d3520430c91.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xopugup/65566366947.pdfIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_3cce5af9baa84665b868a283c28701fc.pdf?index=trueIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_2e3e66f168884692b573caeaadb4c83a.pdf?index=trueIn 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_off0000dafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFC 4636 bytes
SHA-256: c2e1a5c48f28e94aa67d0fa4bd4d2a0817c6138a68141abf0692b4aaa15da978
font_01_sfnt_off0000eadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADD 12332 bytes
SHA-256: 4d7382475f2cc0d26a8c4e7224c70bbb4e7f7eef33e7560e9519a50bd8b1203b
font_02_sfnt_off00011295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11295 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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