Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6f83b7e4439ff1…

MALICIOUS

PDF

83.6 KB Created: 2021-06-01 04:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0a71086a883c44359356cba2d68005c9 SHA-1: 042afc821b0def43ab6d0356e31cf479059ef12b SHA-256: 4d6f83b7e4439ff1b8c30fc4b714acdd3bbcce23ccc268b57f4703ddae303ae6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services and utilize UTM parameters, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://ketchas.ru/pbw?utm_term=how+to+calibrate+essae+weighing+scale PDF link annotation
    • https://kenozojuxezo.weebly.com/uploads/1/3/2/6/132695381/guferiwokesifo.pdfIn PDF document text
    • https://lotogifivetizub.weebly.com/uploads/1/3/4/3/134309957/sovivala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409107/normal_60150ddc82a2d.pdfIn PDF document text
    • https://vevumugenewasu.weebly.com/uploads/1/3/0/7/130776279/lalikovamosokogotate.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456121/normal_60079963cd414.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490961/normal_5fcdb1f17cd93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406463/normal_60186b487d704.pdfIn PDF document text
    • https://mirulunus.weebly.com/uploads/1/3/1/1/131164386/tuxotepot_xomagodukerijeg_julen.pdfIn PDF document text
    • https://womijepadake.weebly.com/uploads/1/3/4/4/134476187/gofafirip-bewavonasu-fokikopefimatez-dutuxixipawak.pdfIn PDF document text
    • https://poxawakepuk.weebly.com/uploads/1/3/1/6/131606289/32dc2c9b50.pdfIn PDF document text
    • https://bezesigut.weebly.com/uploads/1/3/2/6/132681157/b6ae2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ac8bba5-34e2-4ddd-beb9-c0241f928cbe/nirovewugez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d69fe9c4-0909-455e-84b9-1560498b2814/wujolodaxakasaweka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8fe3bf1-3708-4a91-a1fb-7120fcbf8fed/angelcare_soft_touch_bath_support_-_aqua.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ae29307-5ae0-4c24-973b-d557d0e14ef7/navy_special_request_chit_cac_enabled.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144415314/6320488248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46666c06-1f0a-4d3d-aa0e-a3748370d0f5/50218822211.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/f/dosetoxuvofamiwal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7095989-26bc-4ffb-9e3a-5e34acf85aa9/bevujedawolepelesa.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_off0000f4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E5 5252 bytes
SHA-256: 12e11f43ff3a8d418112e1ec11e25788366179cdcea4d04230062cd1bf8de295
font_01_sfnt_off000106c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 10952 bytes
SHA-256: 27d1daec95130c0af9a79d2b6035d6f4b1e41b66e3296085442d292e81a37f28
font_02_sfnt_off00012bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD8 16096 bytes
SHA-256: 1ad30dd47fee4d3db7941b4d3dcb324bc5ea629e4afc38f8bd2427cb89640676