Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a0a710582bef89…

MALICIOUS

PDF

75.6 KB Created: 2021-04-29 17:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0334e3ec67ecd5256c231718e27354e SHA-1: 59810d7fbef8ade588d4cbe51e3ea3857fa18e32 SHA-256: 37a0a710582bef89d725d4aa1637f7e35ef0d7fa263d6ed80254825c0a52c0d6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism for phishing or malware distribution. The embedded content, though heavily obfuscated, appears to be related to search queries, further supporting a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=what+can+i+eat+at+wendy%2527s+that+is+low+carb
    • https://niwubeleligijoz.weebly.com/uploads/1/3/4/7/134764474/e286f5d67c4.pdf
    • https://rimedugomo.weebly.com/uploads/1/3/0/7/130740195/disepi.pdf
    • http://inter-kalinka.ru/979087080711s70p.pdf
    • https://kafazuvowimi.weebly.com/uploads/1/3/4/7/134705673/3e8c2dfb.pdf
    • https://tofudilasikota.weebly.com/uploads/1/3/0/9/130969343/3211479.pdf
    • http://lnstagramverificationbadge.com/326323805879pvdx.pdf
    • https://zagiwutexava.weebly.com/uploads/1/3/4/5/134501554/928844.pdf
    • https://dajadigab.weebly.com/uploads/1/3/2/7/132712332/4133597.pdf
    • https://jutemutugitut.weebly.com/uploads/1/3/4/6/134617260/82a25424f3d9.pdf
    • https://xotizirew.weebly.com/uploads/1/3/1/8/131855992/mimelumazuruvofu.pdf
    • https://kimetupuvojum.weebly.com/uploads/1/3/2/6/132680977/3140175.pdf
    • https://nitikado.weebly.com/uploads/1/3/4/6/134660078/6932129.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_974192aa9ced42c18e9fa15d1d6c067f.pdf?index=true
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_bd8f192c9789494e97c626601b4d4a69.pdf?index=true
    • https://s3.amazonaws.com/dufekifaral/94424351205.pdf
    • https://s3.amazonaws.com/firigugixujotov/2018_polaris_ranger_xp_1000_service_manual.pdf
    • https://291e86d0-b4b7-455e-aeca-30cd05102b29.filesusr.com/ugd/384a46_21b88c39a7f44e2eb1f668e96160e094.pdf?index=true
    • https://s3.amazonaws.com/wefemabeni/livix.pdf
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_ca57b582803e402b965a4925728de400.pdf?index=true
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_ee851529443a4e20bf620ab124ee8fac.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea0d.bin
bd131743833214ed308d565a6d85794a850679f3e502585e7215dec4e53fe33e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 5408 bytes
font_01_sfnt_off0000fc89.bin
8a480eb06a96c5c32ef4192dbc952307cf02284d560c75d4f9501e5c15b30993		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC89 10796 bytes

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