Malicious PDF — malware analysis report

Static analysis result for SHA-256 c011ccfbf1fcb341…

MALICIOUS

PDF

76.2 KB Created: 2021-03-27 16:48:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c05e8177e4543d95823e3dc6511f4ea7 SHA-1: ed5eba4285e5ce804367d57e975c7fd811715fa6 SHA-256: c011ccfbf1fcb341a00a1044c2d02c119cdc23387eb2d3629672ac1259f3f5fa
186 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate an attempt to direct users to potentially harmful external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/123?utm_term=cookie+sheet+dimensions PDF link annotation
    • https://bonadamoge.weebly.com/uploads/1/3/4/0/134000068/nogiboguto-nenusupozeti.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/levodopa_davis.pdfIn PDF document text
    • https://sofugiri.weebly.com/uploads/1/3/4/5/134509821/6312a95e.pdfIn PDF document text
    • https://gawokani.weebly.com/uploads/1/3/5/9/135993895/kepusolevebomor.pdfIn PDF document text
    • https://tusixifowidafoj.weebly.com/uploads/1/3/1/4/131437116/xepomesiwelifuridik.pdfIn PDF document text
    • https://xoludebule.weebly.com/uploads/1/3/4/5/134526363/885347a82276.pdfIn PDF document text
    • https://kexezesokofu.weebly.com/uploads/1/3/3/9/133986719/davinilutejatu.pdfIn PDF document text
    • https://zavuvomexuwu.weebly.com/uploads/1/3/2/7/132740545/jebepozupufeg.pdfIn PDF document text
    • https://roluwisotem.weebly.com/uploads/1/3/4/3/134368144/80a8ba2799f.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/15133626638.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/a_cup_of_tea_katherine_mansfield_questions.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
    • https://uploads.strikinglycdn.com/files/83aa660c-9ced-48c5-b6d4-caf549294f22/english_grammar_learn_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74b24cdb-4f08-4a11-afd1-ba913a795d48/nigenaxitil.pdfIn PDF document text
    • http://mifofoxidil.onlinewebshop.net/jurnal_metode_titrasi_argentometri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea4c33a-d475-4738-96d8-445d8a266673/mafuwowuraxep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d711dc0-c264-4571-997c-ed99bcf324d6/klipsch_promedia_2.1_bluetooth_turn_off.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/61883840518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ac9abf-b11e-48b4-b298-eda93aa5fd64/are_dyson_vacuum_attachments_interchangeable.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/carers_assessment_form_oxfordshire.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/autocad_2017_advanced_tutorial.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_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 4600 bytes
SHA-256: ee7155d08661c6eece1e4fb3631d3cd32922b78e90115e368c3f01757bc81189
font_01_sfnt_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 10400 bytes
SHA-256: 938d39e97700ad3f23e42120732ee69241d3e9538cea52d27c793afecdabd0dd
font_02_sfnt_off0001151f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c