Malicious PDF — malware analysis report

Static analysis result for SHA-256 f640c1b2aa98cfdd…

MALICIOUS

PDF

129.5 KB Created: 2021-05-31 09:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c6bfefd140927a5da628ebf25a139a7 SHA-1: 7aba044d8a420cf5ad580b1cf9b0dbe6fcf558c4 SHA-256: f640c1b2aa98cfddcb2e21bd82e95c9a84c5ae16601042eb896a8a9e3f9c5103
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to seemingly unrelated documents, suggesting a link farm or SEO poisoning tactic. One of the external links, 'https://baarspo.ru/123?utm_term=halal+food+guide+penang', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/123?utm_term=halal+food+guide+penang
    • https://zikibagegun.weebly.com/uploads/1/3/1/3/131398006/zizilufaripuk_pibuzologiza_vadijatax.pdf
    • https://cdn-cms.f-static.net/uploads/4380405/normal_600f2631b4d30.pdf
    • https://mowibusox.weebly.com/uploads/1/3/4/5/134591082/mozosidoborur-mabogugevosoni-fewoduzutisir-nulexirepobo.pdf
    • https://static.s123-cdn-static.com/uploads/4382948/normal_5fdfb7b73bf67.pdf
    • https://static.s123-cdn-static.com/uploads/4374518/normal_5feb2383e4073.pdf
    • https://static.s123-cdn-static.com/uploads/4451556/normal_5febbf78ac523.pdf
    • https://kebopudej.weebly.com/uploads/1/3/5/2/135298692/6882ae49.pdf
    • https://static.s123-cdn-static.com/uploads/4367905/normal_5fe3447adeb1e.pdf
    • https://cdn-cms.f-static.net/uploads/4403421/normal_5fd27f297ffb8.pdf
    • https://dudixugodibemuf.weebly.com/uploads/1/3/1/4/131406925/17666.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f51a39d9-ddbd-4ac1-90d6-a2c7a467b718/best_way_to_treat_piriformis_syndrome.pdf
    • https://uploads.strikinglycdn.com/files/080fed84-50b3-428f-8268-de5cd5b16ce8/16908571338.pdf
    • https://uploads.strikinglycdn.com/files/d87166f7-2a01-42ed-8533-90196d94082b/can_sex_offenders_go_to_state_parks.pdf
    • https://uploads.strikinglycdn.com/files/ef144e2c-6a13-4419-9d3d-f4b3a4a8f39b/are_bryant_air_conditioners_reliable.pdf
    • https://uploads.strikinglycdn.com/files/5bfd0cd0-c37b-42b2-a687-ff0f7a22754b/what_is_the_random_movement_of_molecules_called.pdf
    • https://uploads.strikinglycdn.com/files/64e171a7-16f8-44e5-98b9-c3cc642115d6/23886433291.pdf
    • https://uploads.strikinglycdn.com/files/0e97898e-cac4-4a4e-879f-54d7a5ab46f2/cabrio_washing_machine_error_code_dr.pdf
    • https://uploads.strikinglycdn.com/files/7124ecfb-fff6-4678-ace3-8f546b84ef68/fun_table_topics_questions_for_toastmasters.pdf
    • https://uploads.strikinglycdn.com/files/b88715c3-734c-46f2-9852-ed5603e5d252/how_to_read_audiometry_test_results.pdf
    • https://uploads.strikinglycdn.com/files/4e6f4c3f-1ac9-40db-a0e2-434ae411365a/89808825363.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00017304.bin
15f021f9218717b7574c99ed635b590fcb8d0a2ba2589dbb31e3bad877c1c3b4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17304 25968 bytes
font_01_sfnt_off0001c25d.bin
96ba927a4ce5143d72423ab622ac31b50361dfa8a300abfd3d9ae16e3fcb2004		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C25D 4896 bytes
font_02_sfnt_off0001d323.bin
58894684aad9a34ec78d564c786d8f5cc775508cbdd990599b9355302e38d5e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D323 11028 bytes

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