Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ab197aa0048afc…

MALICIOUS

PDF

98.5 KB Created: 2021-02-13 02:13:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 5818fc1f0bbdc68041cd178ddf8c28b2 SHA-1: 68dbe9c5de0de89c3ea6266661f3dd344a3f41fb SHA-256: 94ab197aa0048afce6d0426523d1cb8b44e17a06e7a8e24189b7d7ed8f318aa8
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large link farm. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the heuristics indicate it functions as a link farm designed to redirect users to potentially harmful websites. The presence of numerous URLs, many hosted on disposable domains or file-sharing services, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/123?utm_term=skyrim+female+creature+animations In PDF document text
    • http://blekrossi.ru/eba_guidelines_outsourcing_agreementslri7h.pdfIn PDF document text
    • https://xugimitedekilim.weebly.com/uploads/1/3/1/4/131482884/4dec2ec.pdfIn PDF document text
    • http://bigno.space/lamifonutad2vdt.pdfIn PDF document text
    • https://vewenaloviriwu.weebly.com/uploads/1/3/2/8/132816087/7446727.pdfIn PDF document text
    • https://fojowixejomad.weebly.com/uploads/1/3/2/6/132681658/pufurer.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/haihahb/kuzavigelakemu.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/eme3HKT/kotaribuxav.pdfIn PDF document text
    • https://vetepoxep.weebly.com/uploads/1/3/5/3/135302771/b535a7555d3121.pdfIn PDF document text
    • https://lifoluzasodani.weebly.com/uploads/1/3/1/4/131437418/bc674142c3c.pdfIn PDF document text
    • https://wimavebitajiki.weebly.com/uploads/1/3/4/6/134609796/5688065.pdfIn PDF document text
    • http://3bureaureport.info/gunamamevirevopiniwunoxuvkwtc0.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/jhAozif/suluwetebopelukibo.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/deutz_f4l912_engine_parts_manualxpdal.pdfIn PDF document text
    • http://getliterate.online/compaction_test_lab_report4re36.pdfIn PDF document text
    • http://byt-upak.ru/397803884209cdva.pdfIn PDF document text
    • https://fiwaluveniwob.weebly.com/uploads/1/3/5/3/135395264/gedizi_bobido_kizedurode.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00012d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D17 5296 bytes
SHA-256: eb7c803745021dfc242687d5463c6ee13ccd58425634a3a049949d305c6d376c
font_01_sfnt_off00013f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0F 11612 bytes
SHA-256: 62a28f1e189995e3e391c84e0603b3c693f87ebc475bbc74d3e6b9e09cfed79b
font_02_sfnt_off000166be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166BE 16240 bytes
SHA-256: d1916b2c7c266658bb54bc7ea291837feb255fde437a4554fb036cc2d65fcbfe