Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf499f5246e6be2…

MALICIOUS

PDF

72.6 KB Created: 2021-05-30 00:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e9cb6d459216c01353934674c5810003 SHA-1: 344ec4742716027232029c4d6312f7dd5c65d18e SHA-256: caf499f5246e6be2fcb3bb8ff5d90dbacc7a8dc5776e73c29844f43a1abb3281
176 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, where the document likely prompts the user to call a number. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to direct users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://soxebez.ru/123?utm_term=clinical+chemistry+bishop+pdf+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467576/normal_5fe317bab695a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_6024854633722.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475565/normal_5fe380e2d4e65.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/5471982.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410207/normal_5ff3f55d04cb4.pdfIn PDF document text
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/delivomejusazel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407086/normal_60566dd99074e.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/0dcfebe3-c224-4727-9f07-9771128f431d/ingersoll_rand_type_30_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b05da11e-098d-4378-9261-a57e5e40412b/how_to_use_bissell_power_steamer_model_1631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca3b10a0-21cf-4978-920f-824c3932512e/34711984205.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fff2d916-fcaf-4873-a6b9-516ec6a29a8f/30915209400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6600fef8-93ec-497a-9934-f1e83e3ceb1f/92407857461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33bac59f-e80d-41af-b6f1-76c0325ba3f2/zipilofetosefuzisigigomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b2b9b71-d4ce-446c-b2b0-53dd8ee89b3e/how_do_you_use_cuisinart_ice_cream_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a33b7a7-6260-4647-bad8-1b0309864be3/what_type_of_charger_does_a_ue_boom_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce43f74-bb8c-4c87-b6a8-68f4acae08fa/58625125917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa8d23da-b6cb-4cf2-b97f-9abfcb38e2c6/mesijogekujanopowediretiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c01d83-6cb8-43d8-a64a-2340d940988e/68452948422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c906c150-2bff-4594-97a5-fa263f926d88/49326406131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b023093-1aa3-4946-8b79-2deed3540bc6/38337338468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33519509-38c1-4017-8d49-5380906d6843/77106650442.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bcfccd1-79d6-4169-bf09-43612f98cac2/fedavuvaxotuzenididilar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b6d305e-d3c5-489d-be0f-67cbe823b561/domofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e8e90f7-e286-455d-90bc-9e5fa81db33b/sony_str_dn1040_vs_1050.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_off0000de02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE02 5636 bytes
SHA-256: a9d4d1de7a334921312772fce34a5ee8db5b9aad20383dec7818bb63ce7fdcfc
font_01_sfnt_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 10540 bytes
SHA-256: 058d72adf09b0d229d164627c832c55f6861326e31b56342e06b808372cfe743

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