Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e3c70c643aac79…

MALICIOUS

PDF

100.2 KB Created: 2021-04-20 23:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 216c10420c360bdf1adfbfcf7eb1cdf2 SHA-1: d8458985377ec1ed84e46d2e3415ceea30192178 SHA-256: 16e3c70c643aac795789d0aa733f1ad3be9117e34c3a2bf1aa192a23b8e142e6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one pointing to a suspicious domain ('bologen.ru') and another to a potential link farm. ClamAV and ML classifiers indicate maliciousness, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 5

  • 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.
  • 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=resumen+corto+del+libro+el+conde+de+montecristo PDF link annotation
    • http://jixuvofariva.iblogger.org/south_park_the_stick_of_truth.pdfIn PDF document text
    • https://kiwiwutirove.weebly.com/uploads/1/3/4/7/134707888/bexezujuwefex.pdfIn PDF document text
    • https://xuxijirabof.weebly.com/uploads/1/3/1/4/131406659/seninifaradopu_xarates.pdfIn PDF document text
    • https://xokufilamiv.weebly.com/uploads/1/3/1/4/131437438/dadikeribowow.pdfIn PDF document text
    • http://lufijep.iblogger.org/adiemus_chords.pdfIn PDF document text
    • https://bokowamimufap.weebly.com/uploads/1/3/2/7/132712050/liwani_wezipelufuni_bisufusifet.pdfIn PDF document text
    • https://regivuno.weebly.com/uploads/1/3/1/0/131070843/liven-loniton-larilej-poluva.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://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_4c253f86890d4eb88355f20c6cf2ab96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/45082205735.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/quantum_efficiency_chemistry_definition.pdfIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_6866cffeef954612a3f5db8cbf1dd072.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/puzonejiwakuwejezudarure.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/all_coming_back_to_me_karaoke.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/barangay_protection_order_form_3.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/michelin_guide_chicago_restaurants.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/pennsylvania_certificate_of_merit_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe047710-c96e-4b6d-9ee9-5651e8bb296a/naomi_klein_shock_doctrine_audible.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/59589523998.pdfIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_ea615cd689a3466cb6e27f1c4e0851fa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b15e17c-0235-4003-9a2b-e430f081ba15/the_river_house_apartments_san_antonio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dadfe804-9268-41c3-ba4a-5b84cec1b968/69457816325.pdfIn PDF document text
    • http://xarajadumep.epizy.com/cessna_421_service_manual.pdfIn PDF document text
    • http://rubuvajaroxe.epizy.com/21955515495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0ad29d5-46b3-4711-ab8d-6411c3c3a426/57862888045.pdfIn PDF document text
    • https://a9b7993f-6967-48c1-a2c3-d5bc86fe985f.filesusr.com/ugd/ea2be3_f3a3c613e71d49f3939911b08e090a75.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wewiro/lagasixorunaj.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_off00013a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9C 4904 bytes
SHA-256: 8f73857418c7fd12043e16b3eb5dcbb17be5dd3b1bfe931f29541dbb67a93198
font_01_sfnt_off00014b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B2C 12664 bytes
SHA-256: 4118f9785a33f6c78c7d1cff6516ca3a7d1b57d1972b3fd8d6082366e8999314
font_02_sfnt_off0001728f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1728F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c