Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea525afb36e8a29d…

MALICIOUS

PDF

75.5 KB Created: 2021-03-19 03:49:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5714d24a44ae071b6d243822d28883f SHA-1: 7e4c20b75eec9cff6854ef541912593ac23648a9 SHA-256: ea525afb36e8a29dc1a6d8088cad7c724520c4ec015fbd49e710818b7337cd70
126 Risk Score

Malware Insights

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

The sample is a PDF file 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, suggesting a link farm or phishing lure. The document body, though heavily truncated and obfuscated, contains text related to 'axial yeti jr wheels and tires', likely a deceptive pretext to engage the user. No scripts were extracted, but the high number of external links and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=axial+yeti+jr+wheels+and+tires
    • http://cccckkkkkdd.space/airserver_activation_crack_serialq7lph.pdf
    • http://bella24.xyz/531830959077h9d5.pdf
    • https://cdn-cms.f-static.net/uploads/4451225/normal_5fdb8a5775227.pdf
    • https://static.s123-cdn-static.com/uploads/4406170/normal_5feb2512737cc.pdf
    • https://static.s123-cdn-static.com/uploads/4493917/normal_5ff383051a8f8.pdf
    • http://cancandance.org/27854024746tr4kk.pdf
    • http://sallehq.xyz/pretty_little_liars_theme_song_youtuberzuhe.pdf
    • http://maritimog.medianewsonline.com/katamabegoropurazivanu.pdf
    • http://tricitysikhs.com/ejemplos_de_ecuaciones_de_primer_grado_de_una_variables4iv2.pdf
    • http://rexevivejegox.scienceontheweb.net/zerumubejoku.pdf
    • http://bestplacefor.rest/namaz_parhne_ka_tarika_in_urduqywqk.pdf
    • http://forecast.bet/81687058197obhyw.pdf
    • https://static.s123-cdn-static.com/uploads/4526930/normal_5feb57189ee09.pdf
    • http://wordsideget.top/buferadokujeragowi9n2z2.pdf
    • http://tozaworewinox.mywebcommunity.org/how_to_value_stocks.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_5cdd1bc14c3f417fa93e9bd0c8a865a7.pdf?index=true
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_d5279a44ddb54e9a966773700ad8a36b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2a0a42e4-00ff-461d-84d3-2f102f35b4f7/dozibududa.pdf
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_71fc5bab3a494b2da4432b2bf7e708bb.pdf?index=true
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_8d7774b0e6c342d9834ff5c8dfc19e36.pdf?index=true
    • https://176fe727-baa2-4f6f-8ab0-cddcd97ecb74.filesusr.com/ugd/45df28_831146feb79a42819377f0e6cee77290.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f0ea57bf-556c-411b-a832-834018719f10/takamuxadobowivozewanobam.pdf
    • 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_off0000e5b7.bin
ee96051d15e5217aa192fad5b64cbc962232207f0f015127190c04ceee691a55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 5240 bytes
font_01_sfnt_off0000f79e.bin
65d41277940a0cb0cca493f137d0d95492296c80c172497b0f25298ee3c26c78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 11688 bytes

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