Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78465faeebed800…

MALICIOUS

PDF

87.0 KB Created: 2021-03-15 06:31:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7ead09e3f5a202f4a47870bf751863ec SHA-1: bce368b42a9650ddaff7f54854d66bf016855670 SHA-256: b78465faeebed8005ea1384bf358731ab7ba0fd4e10f2cea804490d341c5cdc7
196 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many of which appear to be part of an SEO link farm designed to redirect users to potentially malicious sites, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics. The primary malicious URL identified is golowaki.ru, which is likely used for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior strongly suggest a phishing or malicious redirection attempt.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://golowaki.ru/award?keyword=l+alphabet+phon%25C3%25A9tique+international+fran%25C3%25A7ais+pdf PDF link annotation
    • http://tesekal.mygamesonline.org/what_does_taking_adverse_action_mean.pdfIn PDF document text
    • http://kisegojunu.22web.org/nebepojenomaxipon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_a2f241430d04431ab22824c22ba59191.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/how_quantum_computers_work.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/97101711085.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/shrinking_ice_sheets_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/formation_kinsiologie_france.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82252bdb-818b-4cd6-a287-c493c51e0aa8/the_sparrow_bakery_ocean_roll.pdfIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_a6965dcf41b8493a90d213dec8c69daf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/what_can_help_a_teenager_with_anxiety.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5256cdce-6781-4b24-b303-215f42be0de8/basketball_offense_vs_3-2_zone_defense.pdfIn PDF document text
    • http://zotubune.myartsonline.com/89706090999.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/miweforut.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/breakup_songs_free_doregama.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/mcgill_family_medicine_study_guide.pdfIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_e1515d26a101461fa8d1de23e51de8dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/edhesive_exam_2_answers.pdfIn PDF document text
    • http://zozoresupiz.epizy.com/2019_ford_edge_consumer_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/asphalt_8_for_mac_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 5660 bytes
SHA-256: 08a739e969be4a4cac2fc4dd9a0dcd530f67965db5ccffcb4c30e0ba5a17d38d
font_01_sfnt_off00010534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10534 16588 bytes
SHA-256: 71f7abe8807b40203dcc5d81f1ffe9f9dd40a427d331e1d632893b81a3d47b1a
font_02_sfnt_off00013712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13712 16100 bytes
SHA-256: 5270200427a35280080ba2059bb53a7fe71851b5f9466b21cdc3f528a17ee36e