Malicious PDF — malware analysis report

Static analysis result for SHA-256 481f670d3fc99571…

MALICIOUS

PDF

97.5 KB Created: 2021-03-06 13:27:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03ce86ca491b5549789d149fbd406626 SHA-1: 2d9b2652ee918694e5824b6c3c6f7186ecf3d20b SHA-256: 481f670d3fc99571c48f1775c9e2400c963cc2b67fac13e5d8977c23fcd84606
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary IOCs are the external URLs used in the link farm.

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://botokaw.ru/wix?keyword=new+york+draft+riots+apush PDF link annotation
    • http://jexekiraj.sportsontheweb.net/73673004136.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/zicnWoI/online_marketing_strategies_philippines.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/83562604069.pdfIn PDF document text
    • http://dizurexemubegog.mygamesonline.org/39537741464.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/iiamzii/51753549592.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/when_a_guy_says_he_really_likes_you_but_doesnt_want_a_relationship.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/business_management_degree_online_uk.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/0d7d963d-62a7-4e2b-ba48-8cc79a55579d/schwinn_spin_bike_ic3_amazon.pdfIn PDF document text
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_b967197a73944f53b1ec1d0cc3657335.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54d6b732-a7c7-499c-95e5-36b88aad0112/general_physics_multiple_choice_questions_and_answers.pdfIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_bb66dfffb39d416abbcb05a116039567.pdf?index=trueIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_b56add91f852420fbd45aa530705d316.pdf?index=trueIn PDF document text
    • https://6aca245b-72aa-4b14-b829-71607ecc1e06.filesusr.com/ugd/1decf9_1f982f43b09e488e9c24976fe4b2a1b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1090cea9-bf81-4987-b929-cb674148d4fc/quantitative_investment_analysis_3rd_edition_free.pdfIn PDF document text
    • http://pawepeg.atwebpages.com/how_to_locate_hidden_photos_on_iphone.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_da9e05ac81e3474c8d51107cf5363b9c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a7a239d-2377-4e81-a418-064968bf50cd/texavude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82f64226-cc44-441d-8fdb-13b659de79ac/explain_the_three_principal_types_of_business_activity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ea7ecfb-ca42-4ff5-a774-9b8eb718bb34/can_you_renew_your_ny_license_online.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_off000142d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D3 5324 bytes
SHA-256: 0083802d45fef23b188fe03fffa92b4d5686a296c937072932113cebaf72016a
font_01_sfnt_off0001550f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1550F 10536 bytes
SHA-256: 09b17e0e7334fd192e557e416e90c8c5c0d1660a1f1ed650a953703102132bff