Malicious PDF — malware analysis report

Static analysis result for SHA-256 41aa1275a885595f…

MALICIOUS

PDF

86.7 KB Created: 2021-02-24 00:11:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 468d2a4b49efd9414910189e6eafd129 SHA-1: 93973cf7709afb8d17ae981d270ca353710319a3 SHA-256: 41aa1275a885595fbb596aaf760b03829d626d2eb834d55615f9b6a2904c851c
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 hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the presence of numerous external URIs points to an attempt to redirect the user to malicious 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://jottigo.ru/wb?keyword=non%20destructive%20testing%20of%20concrete%20structures PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495400/normal_5fe44795d1ffb.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/gdIhjgi/16899035863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_5fd17cfad7e53.pdfIn PDF document text
    • https://bipipabogudas.weebly.com/uploads/1/3/1/1/131164499/9942875b82dab.pdfIn PDF document text
    • https://nakabupibuf.weebly.com/uploads/1/3/4/6/134608610/tuwinewalegew.pdfIn PDF document text
    • https://suzexefovewav.weebly.com/uploads/1/3/4/6/134640410/fubot.pdfIn PDF document text
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/f2bb8dc.pdfIn PDF document text
    • http://juzajikadig.22web.org/14399297039.pdfIn PDF document text
    • https://likukekubusaz.weebly.com/uploads/1/3/1/4/131408788/mixarupojiwifutan.pdfIn PDF document text
    • https://cdn.sqhk.co/xorazasuno/INIZhhW/diverse_definition_in_world_history.pdfIn PDF document text
    • https://wavikifetin.weebly.com/uploads/1/3/4/9/134901048/zesesofabapob.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/eYxiiai/fast_motorcycle_driver_application.pdfIn PDF document text
    • https://ronukava.weebly.com/uploads/1/3/4/8/134885886/7007689.pdfIn PDF document text
    • https://nugasoxitobaj.weebly.com/uploads/1/3/2/7/132710773/571f1491bbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kelujatideligo.epizy.com/2017_cbr1000rr_owners_manual.pdfIn PDF document text
    • http://fujesotes.epizy.com/4306295992.pdfIn PDF document text
    • http://muvaxuzuf.rf.gd/97241517764.pdfIn PDF document text
    • http://nikavavufuxirel.epizy.com/ubuntu_16._04._3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 4860 bytes
SHA-256: b95bf41dc4b05ef575c3321e786c88d5faa906bc9cde4901f12451fb8624cf0f
font_01_sfnt_off00011a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A47 10948 bytes
SHA-256: f161d8db434b80c58cc7768da8438fb625dc7f1634aceffd23ea53f329e5eae8
font_02_sfnt_off00013f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8D 4324 bytes
SHA-256: 8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd

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