Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ed59bec451a1c2…

MALICIOUS

PDF

84.2 KB Created: 2021-03-16 01:10:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee82dc3b5cfd5e746a3f949fb5e9e3c6 SHA-1: b455335fc0f16863f95ceb5878c73a216557b2b8 SHA-256: 44ed59bec451a1c2c537971b2a2edaa3e44ae3a5e0bfa31ee16dbfe962a16b03
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on external domains. One of these URLs, zajinet.ru, is directly embedded in the document. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through this link farm. No scripts were extracted, but the structure suggests a malicious redirection or content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/wix?keyword=persona+4+golden+naoto+social+link+start
    • https://vevotudoxis.weebly.com/uploads/1/3/5/3/135313682/menelune.pdf
    • http://salonop.xyz/what_causes_aggression_in_petsdb9n8.pdf
    • https://static.s123-cdn-static.com/uploads/4462354/normal_5fe310f69163e.pdf
    • http://eurostore.info/97043622888elfeo.pdf
    • http://ogranifruit.space/desijapejizafujumawutz4e35.pdf
    • https://cdn-cms.f-static.net/uploads/4419645/normal_5fdb9cefe50c6.pdf
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/2772647.pdf
    • https://sujefamop.weebly.com/uploads/1/3/4/7/134762109/sivep.pdf
    • http://sait-ok.ru/17673331997gy79s.pdf
    • http://jajegizu.iblogger.org/pokemon_go_guide_book_2020.pdf
    • https://nepokotivo.weebly.com/uploads/1/3/2/8/132814168/zujegezewusodud-kipumovoz.pdf
    • http://lamovingcompany.com/large_banana_nutrition_informationyof71.pdf
    • http://jobs-ingenieur.best/dibujo_de_rostros_facilesjceun.pdf
    • https://vurodotug.weebly.com/uploads/1/3/1/4/131454057/sexadetekixadik_kovilivujez_benibafezogebo_peresale.pdf
    • http://fodamibokaf.66ghz.com/78657718495.pdf
    • https://static.s123-cdn-static.com/uploads/4368747/normal_6009564174c05.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tevisub.rf.gd/62041874131.pdf
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_9fad7d2335664f998acbdbc7bf805470.pdf?index=true
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_53274903f7be4afea6d8cc86515cd6a6.pdf?index=true
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_c63e8f54bdce4b60b066173beceed042.pdf?index=true
    • http://lugetobuzisufa.rf.gd/bala_tripura_sundari_mantra_in_telugu.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f487.bin
fa99b04edb62886c9c6b9b89dcbc58a6666a76d04fbef1abcd04d283c6d90837		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 5260 bytes
font_01_sfnt_off00010681.bin
bc69b812a337fd033a5be14b52e71a2172105f24e8caf048a0d90de1615dec87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 11064 bytes
font_02_sfnt_off00012ca1.bin
94b9ece9e75b6087aa34b6aeb73ff9aa73d21cfbdb0266ef6d0d36cca08943d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA1 16348 bytes

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