Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a76fb3d3001f2d…

MALICIOUS

PDF

79.9 KB Created: 2021-02-02 23:12:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1fb6e04089bfff13f8c8fb73df2a5352 SHA-1: c11b5610a9cb295101e3482ea1145c88b16bef09 SHA-256: 14a76fb3d3001f2d80dddb0caabb3deed435aadd5706b654960964a3037e03c6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malicious redirection attempt. The document body, though heavily obfuscated, contains strings related to 'assessment biology answers' and 'wkhtmltopdf', potentially used as lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=12.1+assessment+biology+answers PDF link annotation
    • https://cdn.sqhk.co/numokafas/afhgJmT/farm_animals_clip_art_free.pdfIn PDF document text
    • https://cdn.sqhk.co/dedatemaran/ewhcift/european_truck_racing_championship_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460043/normal_5feb715d21370.pdfIn PDF document text
    • https://pudomawiwo.weebly.com/uploads/1/3/5/9/135958378/3f19741e275.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/jcxbZJQ/10887330124.pdfIn PDF document text
    • https://relabibede.weebly.com/uploads/1/3/2/8/132816075/sodibanoloto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419654/normal_60001ddfb3769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416144/normal_60127855e5dae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465691/normal_5fde8646a89a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://setewexevevel.epizy.com/bronto_platform_saddle_cheat.pdfIn PDF document text
    • http://potimafekun.epizy.com/lakuwuratolilujeg.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/77805613321.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/worksheet_on_adjectives_for_grade_7.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/47860132666.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 5460 bytes
SHA-256: 81217ac80c2a36a6ea67eaeb7865c459a2085729cce893598ff8e98f32f49c16
font_01_sfnt_off0000f949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 10460 bytes
SHA-256: 5cfe5c5778b25ba15b63fbd4cd60bf868ceac210b4277a716705629b3a081853
font_02_sfnt_off00011d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5C 16060 bytes
SHA-256: 9fce2e558c7eba93e9b4ba87b790c422cf9490aab73fe875614431ac3e7f116a

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