Malicious PDF — malware analysis report

Static analysis result for SHA-256 3337663e52c087c5…

MALICIOUS

PDF

76.0 KB Created: 2021-03-11 22:43:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1d3658948f65a8718e84402fe71cbf28 SHA-1: ea041ae1ea25e23a58eb8be1d21d04099511ad79 SHA-256: 3337663e52c087c5734aae9cfb4d0de8ace971b4bb57675202d065d9bdd61c73
186 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites. The embedded document body text, though heavily obfuscated, appears to be a lure related to downloading content, further supporting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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.
  • 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://pelibifir.ru/wix?keyword=halo+download+unblocked+sehs PDF link annotation
    • http://penageli.getenjoyment.net/can_you_use_a_universal_remote_on_a_hisense_smart_tv.pdfIn PDF document text
    • http://gamowenugeg.sportsontheweb.net/fufapezojixugibatameraja.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/65325827281.pdfIn PDF document text
    • https://tiwenevudadag.weebly.com/uploads/1/3/4/7/134715745/9ba41.pdfIn PDF document text
    • http://kipegujodup.getenjoyment.net/6243031024.pdfIn PDF document text
    • http://dosubodanes.mypressonline.com/how_is_free_will_described_in_the_bible.pdfIn PDF document text
    • https://bekogome.weebly.com/uploads/1/3/1/4/131454098/793030.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/975ea507-65b6-4824-8dfb-95f40be59fd2/kogexiwosarakuxezosunujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7c063fb-f7ad-47e6-922b-3098e199bf77/momudavoboxeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98403621-a70a-4a2d-8849-8f8a32c08fb7/tukifawimirof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca2c5ea5-aecc-4fd0-b027-43867cbc8cc9/31913050746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96a89189-26a9-4111-a585-624814f1f7fc/dwarf_fortress_adventure_mode_mods.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/musesibivufoporukizepi.pdfIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_0e00dd03051140b18cd77c2afb90b05f.pdf?index=trueIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_c72cf7d91d0b4790a8b1038aa3bb1213.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a15ce223-7ae0-4d96-8d01-6f04fc8f5a32/12919630951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daec16eb-a57b-4fd4-a6bf-4e7a66274def/30262925646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb114381-78d6-4b6b-a2c8-2bfdc617fc44/convert_paint_to_word_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a65da041-1b2a-4054-b87b-a4988aec3a8d/guitar_beginner_chord_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/kevivemizixif.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_off0000eecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 5188 bytes
SHA-256: 45ff94ff494abd3f5300aa4719d585ce5612316c2ed85ca7c993763dacdc3667
font_01_sfnt_off00010083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 10104 bytes
SHA-256: b626ba77ea8652494d8403705ce2038a408222cc90f557d1f021b79b54367e5b