Malicious PDF — malware analysis report

Static analysis result for SHA-256 356419c3f9d6ab2f…

MALICIOUS

PDF

81.5 KB Created: 2021-03-11 10:49:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: ca35f9811b4f6ff52203a2eff0126d09 SHA-1: 6dc9954d3293656c56022f9e557b816831344001 SHA-256: 356419c3f9d6ab2f2a4add3af68a2f75f9928c6f280d7d63091326fb5674a692
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wb?keyword=cognitive%20psychology%20theories%20of%20memory PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497688/normal_5fdbffacc4193.pdfIn PDF document text
    • https://jivupofa.weebly.com/uploads/1/3/1/4/131406879/3298626.pdfIn PDF document text
    • https://vugevosuza.weebly.com/uploads/1/3/5/3/135328642/mogoxeda.pdfIn PDF document text
    • https://dipafasimabake.weebly.com/uploads/1/3/1/1/131164320/redoje.pdfIn PDF document text
    • http://pofitasexa.iblogger.org/ubd_design_template_blank.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/igtgdlH/77482484304.pdfIn PDF document text
    • https://divetuguwopad.weebly.com/uploads/1/3/0/7/130739619/zemug-wobuxupixot.pdfIn PDF document text
    • https://wojemalivameju.weebly.com/uploads/1/3/0/7/130775107/sodap-nikubinip-lavigomuzitiva.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/ia8Pegj/zombie_frontier_3_hack_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412762/normal_5ff62bf6d9198.pdfIn PDF document text
    • https://cdn.sqhk.co/piwixesiwufo/geLgds6/35690867588.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/hchdjcp/xububigujisatawuvavi.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/4e430a7e-ab89-4ba4-a7b9-81804b6d2fe0/kenmore_connect_error_code_oe.pdfIn PDF document text
    • http://tizebowikono.rf.gd/58072014923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d2a1c4-c048-4a74-8c38-47b36ef43a9c/dozejajik.pdfIn PDF document text
    • http://zabetexukiked.epizy.com/fefap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4fe984c-ffaa-4ffc-ac29-2fbccd4eb938/77726460910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5190799-0566-499c-8362-a0b4dc389e5c/mexusikenugus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07d437e2-5c7f-4e94-82b6-01627c0c6b81/mumobosibob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0226ee51-ad8f-47e4-9f1c-fc8ab2916419/54377861543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5a59cd6-3e2f-48e0-9151-72d2aed5559c/66552038560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9dc821a-0f8a-4aa5-ba90-b46bf68963cb/hp_laserjet_p2035n_offline.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_off00010227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10227 5288 bytes
SHA-256: 04a9a0197508dc257a49cd18c17f8cc9592af3f60dc2b99baacbce6f9dc1f74a
font_01_sfnt_off00011411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11411 10704 bytes
SHA-256: ef67e94f785bf2e8f7dc54798b17abb6d510d369b27cb971dd9c8b5021bb7831