Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3cbb3b17f9cae3…

MALICIOUS

PDF

117.4 KB Created: 2021-03-20 15:46:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fd5f3bd0307c3e2819d96d55a85b2c5 SHA-1: d4f49abfc4e078872f883d45a699e13bb4b248d0 SHA-256: bf3cbb3b17f9cae3610c715617c58b792a2dd21cdb7b364d710b60c0fcfab982
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/award?keyword=trauma+abdominal+cerrado+pediatria+pdf
    • https://jokonufukitis.weebly.com/uploads/1/3/4/3/134399540/3161186.pdf
    • http://safijejog.mygamesonline.org/64236414399.pdf
    • https://falufanimuv.weebly.com/uploads/1/3/4/3/134377488/8208534.pdf
    • http://pusovemolexed.scienceontheweb.net/bromatologia_mendoza_libro.pdf
    • http://fofumumitem.medianewsonline.com/what_are_the_main_objectives_of_performance_appraisal_in_hrm.pdf
    • https://lovelutunaguj.weebly.com/uploads/1/3/4/7/134735325/5356356.pdf
    • https://dupudebokuvufex.weebly.com/uploads/1/3/2/3/132303235/65d770e7.pdf
    • https://static.s123-cdn-static.com/uploads/4444864/normal_5ff0726a86d5a.pdf
    • https://gebezemimubitup.weebly.com/uploads/1/3/1/0/131070169/b5b82c3a5925b7.pdf
    • https://cdn-cms.f-static.net/uploads/4393521/normal_6022543c2432e.pdf
    • https://bosamekuxukis.weebly.com/uploads/1/3/4/6/134672370/vobenoduwe.pdf
    • https://cdn-cms.f-static.net/uploads/4402720/normal_600c0b1351f30.pdf
    • https://viwejidem.weebly.com/uploads/1/3/1/4/131406222/judafisinolipod-karezi-febizifuvujone.pdf
    • http://tapozifokun.mywebcommunity.org/vekijoba.pdf
    • https://vutepunuvo.weebly.com/uploads/1/3/1/6/131637517/sigam-zigevulizawisi-revefut-tatevado.pdf
    • https://sudesiresa.weebly.com/uploads/1/3/4/8/134881981/3a702479b7d7bdf.pdf
    • https://cdn-cms.f-static.net/uploads/4367301/normal_600b647280c52.pdf
    • https://static.s123-cdn-static.com/uploads/4404116/normal_5ff3bd1f3859c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dinilederu/nevagizobejek.pdf
    • https://s3.amazonaws.com/napoledunadigo/divuxakipavezuwagatub.pdf
    • https://s3.amazonaws.com/vipinib/bcd_to_7_segment_display_datasheet.pdf
    • https://s3.amazonaws.com/sorogamat/wapking_movies_2013_hd.pdf
    • https://s3.amazonaws.com/xuzakob/serious_side_effects_of_metformin.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_off00018c63.bin
a263a340cddd3a48e9b34bf8f378532733fae0b73590b939341547a2b3809774		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18C63 5212 bytes
font_01_sfnt_off00019e00.bin
e049e27cb68925a0d7da0817c78710b8a7653265e6a6f6120874f0c4f04b67d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19E00 12276 bytes

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