Malicious PDF — malware analysis report

Static analysis result for SHA-256 51edaf11f1a840c6…

MALICIOUS

PDF

74.9 KB Created: 2021-04-07 20:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa3aa8e2e81a016288ae6cfd698ceed0 SHA-1: a2180285a92cd83530f1b105825de253f93180d2 SHA-256: 51edaf11f1a840c6f925541f4fcb13ab3385746bbb68892d11ff0cef887a3f68
156 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing a large number of external URLs, with a critical heuristic firing for 'PDF_SEO_LINK_FARM'. The primary URL points to a suspicious domain, suggesting a phishing or malicious redirection attempt. While no scripts were directly extracted, the nature of the PDF and its numerous links indicate a likely attempt to lure users to external malicious content, potentially for credential harvesting or malware distribution.

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://seumenha.ru/strik?utm_term=life+fitness+c1+lifecycle+exercise+bike+c1-xx00-0104
    • http://mybatut.store/95163570744oa2c2.pdf
    • https://dojoxokixen.weebly.com/uploads/1/3/4/8/134878929/jezizobokeranewux.pdf
    • https://ruvawuwejijexut.weebly.com/uploads/1/3/0/8/130814193/1657592.pdf
    • https://munelexogetajax.weebly.com/uploads/1/3/1/4/131437313/bebeti.pdf
    • https://rakevuxex.weebly.com/uploads/1/3/4/0/134040666/651be03e5c.pdf
    • https://vunorizuwuxina.weebly.com/uploads/1/3/0/7/130774993/903680.pdf
    • http://com-connexion.xyz/witebuveweshecz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nuselufuzo/51908104867.pdf
    • https://uploads.strikinglycdn.com/files/1972f9b1-56b1-4868-b3f6-fef1b4f1cf60/givusesuxun.pdf
    • https://s3.amazonaws.com/sigobija/escape_room_level_43_answer_travel_plan.pdf
    • https://uploads.strikinglycdn.com/files/f240a5ee-4f14-4f55-8547-fa4af693e144/gatakiterurejukulovega.pdf
    • https://s3.amazonaws.com/bugutaj/corset_top_formal_dresses.pdf
    • https://s3.amazonaws.com/jolozidabi/79641069126.pdf
    • https://s3.amazonaws.com/midaguvimabof/76240208559.pdf
    • https://uploads.strikinglycdn.com/files/3151bc5b-c98a-4871-96e7-606cbf6a0e4f/65947738296.pdf
    • https://s3.amazonaws.com/xisefowu/les_cours_d_anglais_gratuit.pdf
    • https://s3.amazonaws.com/sorogamat/principles_of_risk_management_and_insurance_thirteenth_edition.pdf
    • https://s3.amazonaws.com/pegek/rivuno.pdf
    • https://s3.amazonaws.com/kugelilizibuwum/el_ensayo_argumentativo.pdf
    • https://s3.amazonaws.com/wazorixekunafob/zogijowobuvi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d99c.bin
f63f4ebd7e9a050fabfc10557eda9198c361c4570def4690fa362ff7c65c8d9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD99C 3048 bytes
font_01_sfnt_off0000e465.bin
42187f235bc69bafa5e8e9ef560d7a2ec5462e527192698b3d9702a1bf0c0395		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE465 5292 bytes
font_02_sfnt_off0000f6a5.bin
2aaaf4767d8adacd9a50911c0b76da87c4a90632f812cadc55b2ee65c9af30c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 11440 bytes

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