Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c053796e0da517…

MALICIOUS

PDF

77.9 KB Created: 2021-06-10 02:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2b005adcd5370663314d2d3834896d1d SHA-1: 345b044b45fe838cff6bb33ea0e06ef4bd374276 SHA-256: a7c053796e0da5179ae41c3a8b83dedde18e7cf95ac391381a7df95ea6ce99cb
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The presence of a "subway surfers hack 2017 apk" reference in the document body, combined with the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, indicates a lure to potentially malicious content. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://allytemp.ru/pbw?utm_term=subway+surfers+hack+2017+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369165/normal_5fe4e0d7b6b08.pdfIn PDF document text
    • https://rofotemajanati.weebly.com/uploads/1/3/4/4/134497193/7360410.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474457/normal_5feb5ff504348.pdfIn PDF document text
    • https://nodokesomizi.weebly.com/uploads/1/3/4/6/134656280/db0bfc1bf2f4a08.pdfIn PDF document text
    • https://ditoxinenibon.weebly.com/uploads/1/3/4/3/134324582/petikizobori.pdfIn PDF document text
    • https://ruritetij.weebly.com/uploads/1/3/4/7/134704214/4387225.pdfIn PDF document text
    • https://peniwifagupe.weebly.com/uploads/1/3/0/7/130738894/1d92cdb01cb77b0.pdfIn PDF document text
    • https://zenibevakuziva.weebly.com/uploads/1/3/0/7/130739170/nuwuvanon.pdfIn PDF document text
    • https://sevivuninuk.weebly.com/uploads/1/3/4/4/134459749/446073d9d41660.pdfIn PDF document text
    • https://julamebuviweto.weebly.com/uploads/1/3/4/5/134509829/pasumus-tatab-jekuzu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sorawako.pbworks.com/f/tasasepetudukosutusajeful.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e40ef68f-f4b7-4fb1-b33f-da3ac1789eab/good_soccer_workout_routine.pdfIn PDF document text
    • http://gipovowi.pbworks.com/w/file/fetch/144961113/xugefusopexed.pdfIn PDF document text
    • http://gijorugisaw.pbworks.com/w/file/fetch/144504267/buxitexomefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d3cf228-a2ab-4298-a2e0-71e44b2eaaf3/nigumuzapire.pdfIn PDF document text
    • http://taxoxuf.pbworks.com/w/file/fetch/144690858/pathophysiology_free_book.pdfIn PDF document text
    • http://xereledo.pbworks.com/w/file/fetch/144803196/how_do_you_use_the_neatcell_picosecond_laser_pen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b697939d-7fa2-4b79-a39e-b18c10f06378/how_to_replace_graco_spray_tip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d540201d-61bc-461f-a1e0-b4d1bc0bb2a3/tipubepebagitevo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83B 5976 bytes
SHA-256: b3d838bd00f7dab60edfc0b943454e18ee2d60863555779a744128a8aaab72be
font_01_sfnt_off0000ecb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 10344 bytes
SHA-256: 30913b238a0840e243e22878ae7eeab6ae7baffbbda278d21c0c00b09e1f28bb
font_02_sfnt_off00011056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11056 17456 bytes
SHA-256: fc18c870b522095b5e3908f99cd980483c3d40c263b18dc29d987568840f3a16