Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc63705249a609ee…

MALICIOUS

PDF

83.3 KB Created: 2021-03-31 21:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ca26c982d3d3d0bfcccd9c6c2f07f2d1 SHA-1: 2d60f2f77a024abba2faaa0ff3fd71988540c2e9 SHA-256: fc63705249a609ee4992829d59a06846981e5443978c694c004d563a256c3e56
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or engage in phishing. No scripts were extracted, but the sheer volume of outbound links on potentially untrusted domains is a significant indicator of malicious activity.

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://bologen.ru/strik?utm_term=what+is+the+true+story+of+the+phantom+of+the+opera PDF link annotation
    • http://baffer-shop.space/lamina_de_la_jarra_del_buen_bebershwny.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494661/normal_6035b1faec317.pdfIn PDF document text
    • https://wutomafokusax.weebly.com/uploads/1/3/5/3/135314756/48f404d.pdfIn PDF document text
    • https://cdn.sqhk.co/sozivowemin/anhdyDi/64097387401.pdfIn PDF document text
    • http://xteenware.online/how_to_connect_a_manual_boost_controlleruy0tx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405903/normal_5fe46e322cd05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_60649dbf6e02f.pdfIn PDF document text
    • https://tixonanixob.weebly.com/uploads/1/3/4/8/134890866/5434868.pdfIn PDF document text
    • https://cdn.sqhk.co/lanasido/VjgvMjb/free_mobile_phone_wallpapers_and_themes.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/hcgfic2/top_100_time_magazine_covers.pdfIn PDF document text
    • https://vopasigujar.weebly.com/uploads/1/3/0/8/130813381/9090675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461509/normal_600daf316ab72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415946/normal_605b18c544c22.pdfIn PDF document text
    • https://cdn.sqhk.co/vunalogivefu/jhdhagf/92194372500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459483/normal_5fd383fa39b22.pdfIn PDF document text
    • https://cdn.sqhk.co/vojazodelud/Nhgcghf/idle_tap_splash_park.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456666/normal_6056f7087a556.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001069b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 5224 bytes
SHA-256: 8e2c73d761b4b2a26ad9a2da54103fbd3f1340bc6e4b19d421ecdac86c26d687
font_01_sfnt_off0001184f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184F 12192 bytes
SHA-256: c1e7d19ff4dbc70f17dea22e97927b0c6cbf016e6c126a9ac06ec1dd745fa11c

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