Malicious PDF — malware analysis report

Static analysis result for SHA-256 8852da701a7b1174…

MALICIOUS

PDF

118.8 KB Created: 2021-02-06 08:56:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6a1063f5370ddc20c29e39813692e4d5 SHA-1: f9493bed04459fe11ed03fdc52fba8153af0b4d7 SHA-256: 8852da701a7b11744c5f563331044b81ea21709c0e7dcf2e041a29a7c085e357
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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/123?utm_term=written+on+the+body+summary PDF link annotation
    • https://lonokowikur.weebly.com/uploads/1/3/5/3/135384913/sakanaxu_jeziwonedigu.pdfIn PDF document text
    • http://medway24.com/bodmas_questions_in_hindiihnis.pdfIn PDF document text
    • https://radokixudex.weebly.com/uploads/1/3/5/3/135342076/d2093c3cbf99f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493553/normal_5fe317ab68930.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/736cc44c7b53.pdfIn PDF document text
    • http://grizhoff.ru/bunker_hill_wireless_security_camera_62367_manual4ivv9.pdfIn PDF document text
    • https://rofasaxoropop.weebly.com/uploads/1/3/5/3/135316675/4832488.pdfIn PDF document text
    • http://rusakova.space/double_gun_journal_complete_set9u7r4.pdfIn PDF document text
    • http://vk-settings-change.online/adhyatma_ramayana_telugutiicm.pdfIn PDF document text
    • https://fakegegi.weebly.com/uploads/1/3/5/3/135312823/foguwirusuludowu.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/feradadodowixusazl9cgq.pdfIn PDF document text
    • http://summer-italy.fun/woboripowexejusci43a.pdfIn PDF document text
    • http://mebelrostov.ru/bunny_runny_nose_and_eyes_burningyezre.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420470/normal_601da87fb92a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wozawexopad.epizy.com/mansa_musa_civ_6_guide.pdfIn PDF document text
    • http://jogulele.epizy.com/5e_ranger_gloom_stalker_guide.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_off0001965a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1965A 5288 bytes
SHA-256: d3a9bf636099e3bef40b94a40479b74187fc0a5ed3229ebd3503a084d2d1b191
font_01_sfnt_off0001a832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A832 11276 bytes
SHA-256: 23a2eafbb78b4627ae2af5d6d60ed747cc4102b61077ed8041589545093b2e96