Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52ab24fc33361d6…

MALICIOUS

PDF

75.6 KB Created: 2021-01-17 05:49:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: e8f4caec08b0f353e413bccab1964d8c SHA-1: 358dd152e097c2354197061d31bbf6a2801b609b SHA-256: f52ab24fc33361d62715c2d0567184726bac4cda6a655897e466e9b17ec6fbf6
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 0.9997

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://trafficel.ru/123?utm_term=the+shannara+chronicles+torrents PDF link annotation
    • https://kupukibofiwu.weebly.com/uploads/1/3/4/8/134862242/banik.pdfIn PDF document text
    • https://wefexubi.weebly.com/uploads/1/3/2/7/132712326/34174b3af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403936/normal_5feba2fc9c0b2.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/fifjejj/mutants_genetic_gladiators_cheats_2020.pdfIn PDF document text
    • https://site-1176918.mozfiles.com/files/1176918/short_love_stories_on_amazon_prime.pdfIn PDF document text
    • https://site-1168052.mozfiles.com/files/1168052/nawoxurafufubumotatagok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387808/normal_5f965fb44be30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488322/normal_5fb34d51613a2.pdfIn PDF document text
    • https://nipazutilufap.weebly.com/uploads/1/3/0/7/130738662/c837a72744.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418565/normal_5ffb583b3caf9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wejuvono/creepypasta_character_sheet.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

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_off0000d2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B8 4836 bytes
SHA-256: 8c9b02f89e0b9b1d8894e3146332cbfcd40d02ba144bea24379e1e45128ad116
font_01_sfnt_off0000e31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31A 10884 bytes
SHA-256: 9eeb52e080e362f85c4e44fcf2849827400e6cde14c2a4ed6dc654e8d4d615d5
font_02_sfnt_off000107cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CF 17284 bytes
SHA-256: 8119fe2c49d1892b4b99c8b0d0c8d127f7d37d283998934b3bcb966c8577ade0

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