Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af505d1920ceb62…

MALICIOUS

PDF

83.2 KB Created: 2021-04-29 23:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e4f28ca115b30d91dfe7658e1d219da1 SHA-1: 40abe94a744cd73545fb4b1b05dda749980de263 SHA-256: 3af505d1920ceb62b7bcdea43ed8b885a32e22680143168ba5ff1486d1ad4093
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary URL, https://seumenha.ru/strik, is likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=how+to+clean+dr+brown+bottle+sterilizer+with+vinegar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413966/normal_603908f357df0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403418/normal_60651646641f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365624/normal_5fd083fd3cc2a.pdfIn PDF document text
    • http://kusoxesarudomu.22web.org/1971_ford_mustang_mach_1_horsepower.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_603df0e014a27.pdfIn PDF document text
    • https://mixufatinir.weebly.com/uploads/1/3/0/7/130739404/bigowiku-xalojanuzud.pdfIn PDF document text
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/mobadaz_likugeramexepux_penabexikasev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447466/normal_602cf6f2491b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379970/normal_6049551ccf459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5fe75b518b389.pdfIn PDF document text
    • https://fojiwuduz.weebly.com/uploads/1/3/5/3/135309278/7530773.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465914/normal_60052fa7516e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bibarixe.epizy.com/85111478871.pdfIn PDF document text
    • http://nafakosoleg.epizy.com/french_present_tense_verb_conjugation_quiz.pdfIn PDF document text
    • http://foletakusuwavid.rf.gd/tajemonimanukovofaxaboduk.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/cursor_in_oracle_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/free_word_cover_page_templates.pdfIn PDF document text
    • http://gafigozigu.epizy.com/boss_riot_r1100m_wiring_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/iso_27001_2013_free_download.pdfIn PDF document text
    • http://gowuzabe.epizy.com/onkyo_tx-nr515_dimensions.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_off000104ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FF 5504 bytes
SHA-256: 9cf69611b29c5f09fe198374936c2cab732a3200b487e34bfa65d208537d86a7
font_01_sfnt_off000117cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CD 11128 bytes
SHA-256: 23e43c894b8a3f8469aca5672ff5fc668fb0331711d81dea72f94db1009def7b

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