Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7dfb87afa5d2b3…

MALICIOUS

PDF

74.7 KB Created: 2021-04-29 18:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ecaf1b776d353096a3dbd2d5d1fbce0 SHA-1: b791ff48886645e23a80cfa470df4aec8200af48 SHA-256: 6b7dfb87afa5d2b38f6d1a649cf41f49ee4b0c2085fd9741d544645b757b832f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files hosted on file-sharing services, suggesting a link farm or phishing attempt. The primary URL, 'https://pelibifir.ru/strik?utm_term=how+much+does+a+total+gym+1000+cost', is likely part of a campaign to direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=how+much+does+a+total+gym+1000+cost
    • https://jafiwivejo.weebly.com/uploads/1/3/5/3/135305612/wurudukak_redeze_farabanukipate.pdf
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/9993699.pdf
    • https://gunowiwusofemu.weebly.com/uploads/1/3/4/7/134705227/6a07ddffe17fc2.pdf
    • https://sekorora.weebly.com/uploads/1/3/4/8/134856449/vewojoraxokazonab.pdf
    • http://ideal-it.fun/what_is_genre_in_film_reviewzcojr.pdf
    • https://bumipavadawafez.weebly.com/uploads/1/3/2/7/132710759/dadujejafupojina.pdf
    • http://qqkaxes.xyz/paypal_credit_payment_planu1mwf.pdf
    • https://tivubolo.weebly.com/uploads/1/3/1/8/131857038/beded-xuxoripagopo-tenabe.pdf
    • https://ditixalopu.weebly.com/uploads/1/3/1/4/131410538/3074983.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_431910be82e6462abde7cc8e6e66eb87.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c35e50a5-cdb3-4ed6-9ee3-bba3f42403e1/fexovumujewa.pdf
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_30ec09daf21043e2819f406e6f54d303.pdf?index=true
    • https://s3.amazonaws.com/veledabejufi/30457101787.pdf
    • https://uploads.strikinglycdn.com/files/4b5a47af-da2c-4ac6-ac0f-1e3641e6ee37/nepibimufototesuk.pdf
    • https://uploads.strikinglycdn.com/files/c90f8655-171e-4444-9696-075a57ec21de/jumesegojekujar.pdf
    • https://s3.amazonaws.com/busutafitufe/letter_logo_design_template.pdf
    • https://s3.amazonaws.com/fadobirak/what_are_the_36_spiritual_principles_of_aa.pdf
    • https://uploads.strikinglycdn.com/files/bdca2ae6-d92c-4d0d-b325-ff2de1ec39c9/harrison_principles_of_internal_medicine_21st_edition_free.pdf
    • https://uploads.strikinglycdn.com/files/2d642010-57ef-458d-8fcf-87ca30c522c2/zodivagidawimejox.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_off0000e714.bin
65bccd1e936b5e2b1de30178311dc949a00d9ca03ac52dc128684ba61ebd7f42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE714 5608 bytes
font_01_sfnt_off0000fa19.bin
9145c6a952f859f8efba5263e9592294c52e5549d96d0dc65c4534c4ef94e6c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA19 10444 bytes

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