Malicious PDF — malware analysis report

Static analysis result for SHA-256 e98dc1f1a90733fa…

MALICIOUS

PDF

71.4 KB Created: 2021-06-12 02:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 578e9f919476bebdb998dfe619a691a6 SHA-1: ef3c974ef5c5061e122cd57519930378a6fb7c26 SHA-256: e98dc1f1a90733fa1b0986d67a63739bf9f3bd1fd8157825e4bac65ad0edc52f
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, directing users to numerous external PDF files hosted on disposable domains, likely as a lure for downloading malware or phishing for credentials. The presence of a 'download' button heuristic further supports the malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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
  • 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://huntic.ru/pbw?utm_term=gajendrudu+telugu+full+movie+download PDF link annotation
    • https://lajakobu.weebly.com/uploads/1/3/4/5/134599687/1006264.pdfIn PDF document text
    • https://kuwofepex.weebly.com/uploads/1/3/2/7/132740654/0594aaaa0bd8c.pdfIn PDF document text
    • https://zosetujisux.weebly.com/uploads/1/3/4/2/134266291/942417ea5.pdfIn PDF document text
    • https://kivogumit.weebly.com/uploads/1/3/1/0/131070776/5773559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495059/normal_5fd217ee11976.pdfIn PDF document text
    • https://mejexagisogikez.weebly.com/uploads/1/3/4/4/134468566/68b0d587f5b7a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375541/normal_605cba0c59124.pdfIn PDF document text
    • https://xetolakovi.weebly.com/uploads/1/3/4/6/134604046/1698445.pdfIn PDF document text
    • https://defutijobazaso.weebly.com/uploads/1/3/4/5/134587482/getudito.pdfIn PDF document text
    • https://liwojugimigazip.weebly.com/uploads/1/3/4/9/134904469/zesidajurewonuki.pdfIn PDF document text
    • https://wegetifadozapuf.weebly.com/uploads/1/3/1/6/131637062/9869175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471686/normal_60431cb5b6be3.pdfIn PDF document text
    • https://domexuvuk.weebly.com/uploads/1/3/0/7/130740212/3485821.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407069/normal_5fde5ea8f22f0.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/380f5d62-7812-42f8-9ff9-f3f26ed91827/dipamadekoxivotu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f26c48c-8783-4161-b7b7-062125ea4f96/kamulatebajobakusib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33ee3c04-8538-439c-9df8-d659f59a91a3/52440366143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2885ff6-b5b6-4528-ad1d-97a94a0952a7/35255728109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f391c30-5db2-40b9-bafa-67333f938d71/gavorefivorenilativa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13429e45-4a27-4255-b50f-b4b16aa33141/64729490671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5049071f-f433-432c-b3e9-4836d8185e5a/baahubali_2_tamil_full_movie_free_download_hd_tamilrockers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0febced1-cdf1-4e52-9b6b-59c533e4e3a8/network_analysis_objective_questions_and_answers.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 5308 bytes
SHA-256: a2013c33890069fbf5fdf1a31d6289f1497929ad9ac21fffff2245cca6b03268
font_01_sfnt_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 10340 bytes
SHA-256: 88d0e9f82c200d4103faa85887bce717ed424531abf6f99b849192076292c3c0