Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2bb3d49897d5aed…

MALICIOUS

PDF

71.2 KB Created: 2021-03-09 19:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e85aac72a6b585607c06178aa0b4c9d0 SHA-1: 2a3605ec2fd11f84090b6e0d4cad57a162f34e9b SHA-256: a2bb3d49897d5aed231f5f083426e71d998d685d7cd27a1325937f71b2db8441
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, including critical alerts for linking to known malicious redirectors and hosting a link farm. The embedded links, such as 'https://dafemum.ru/award?keyword=may+calendar+2020+printable+pdf', are designed to lead users to potentially harmful websites. The document's structure and the nature of the links suggest an attempt to exploit users through phishing or redirection to malware distribution sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=may+calendar+2020+printable+pdf In PDF document text
    • http://peroruse.iblogger.org/finding_midpoint_and_distance_worksheet_answer_key.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460680/normal_604111979cc2b.pdfIn PDF document text
    • http://kabikuli.iblogger.org/how_to_apply_decals_to_car.pdfIn PDF document text
    • http://fezatubiwe.getenjoyment.net/41586547008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387224/normal_5fd8d47724b3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416927/normal_603323894d007.pdfIn PDF document text
    • http://futegejetebe.22web.org/fejajobaguweruroneso.pdfIn PDF document text
    • http://bitalotava.scienceontheweb.net/ferrari_812_superfast_mansory_prix.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/fbad7cd7-3a5f-450a-9a13-8277f46facce/ant_colony_optimization_code_in_c.pdfIn PDF document text
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_928a7cab8e854cc9907a46c9f19880cb.pdf?index=trueIn PDF document text
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_9cd5fce144e24cb3bac2fc33de84d6ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1b995d-c030-49e0-a90f-0249cd6ff565/what_is_imagery_in_sports_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08c36e93-0d7f-44ff-afbd-df133697a943/42260109471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a29d768e-8a2a-4245-b018-f462d7667464/58207769055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e30638c9-ba98-4bfc-80d9-c99beff46860/masterbuilt_oil_free_turkey_fryer_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdd009be-010d-4161-a1e2-71819c39cff4/72496642840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1aa5a88-12f0-4add-93ba-4cbe064b34b8/when_will_ncdmv_open_for_road_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6be67f7-d4aa-433e-8adc-679c2490eaaf/razer_blackwidow_ultimate_2013_price.pdfIn PDF document text
    • http://jexesomaw.epizy.com/wawazikarowupogivojafosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e861ebe-9c7b-4e90-88e2-8d87fc91a42b/60354897795.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_off0000d9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C8 5492 bytes
SHA-256: d198225723684f33ca642c82d91f924f4ff6b0a0f0722732fccf7a517fac5cdb
font_01_sfnt_off0000ec91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC91 10208 bytes
SHA-256: 6a0d484fea5aa2175ef8f892054b80fc1d68c4d97fff6fd906e0e6b692491d5d