Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a8ba713ebe63fb…

MALICIOUS

PDF

81.0 KB Created: 2021-03-03 20:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: fca3b1165ede48b79d46e290fd06b83b SHA-1: 6bf73401eba08973fb7d98d194e98cefced191d6 SHA-256: b4a8ba713ebe63fb112885ac6ccc6ceffa84f2313f831d92d293122065716eca
186 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, suggesting it functions as a link farm or part of a SEO manipulation scheme. The document body, though heavily obfuscated, contains references to 'pyramid plunder minigame guide osrs' and 'wkhtmltopdf', indicating a lure to attract users interested in gaming content. The presence of multiple external links, many hosted on disposable domains, points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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/wix?keyword=pyramid+plunder+minigame+guide+osrs PDF link annotation
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/8c981d5.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/NgdL8jg/89833550993.pdfIn PDF document text
    • https://wazolupagod.weebly.com/uploads/1/3/0/7/130775763/pitepekoguf-sigudulegafi.pdfIn PDF document text
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/7d47f4b83ec.pdfIn PDF document text
    • https://cdn.sqhk.co/libarazituw/hNnwjhd/50292809917.pdfIn PDF document text
    • https://cdn.sqhk.co/bavimimo/Fjijjcv/91057570405.pdfIn PDF document text
    • https://burerekubexu.weebly.com/uploads/1/3/1/3/131381452/zaguwaso.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/aDghick/guess_one_meaning_in_tamil.pdfIn PDF document text
    • https://jomefibid.weebly.com/uploads/1/3/4/5/134596324/c9ceef6f9cbe367.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388424/normal_5ff85c30474c3.pdfIn PDF document text
    • https://cdn.sqhk.co/sezunofubuzi/MskjiZI/shadow_fight_3_pvp_beta_download.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/vosimalume/49671623000.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/phanteks_enthoo_luxe_2_dual_system.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/guzipiwaxofof.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 5380 bytes
SHA-256: 878fc92035e0b845a451fc3f41796b4b188bdc17539e1b487cd1eae5dcc5c515
font_01_sfnt_off000112ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CA 10608 bytes
SHA-256: a94293615bca21031a8f8b6cf0f3fad46e7c893660c470664de81e1d0f8f1dea

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