Malicious PDF — malware analysis report

Static analysis result for SHA-256 612d7586e01fd3de…

MALICIOUS

PDF

75.0 KB Created: 2021-03-13 16:04:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: b16f89b01a74ffad0049983f0df25dba SHA-1: 58c29b969ed26d0b5af41398f1a4b3fb12f21525 SHA-256: 612d7586e01fd3de237bdf79ab36151b0ed564e3d60c37fb7d78a784ec2491ec
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://zajinet.ru/award?keyword=botulinum+toksin+uygulamalar%25C4%25B1+pdf PDF link annotation
    • https://cdn.sqhk.co/dalegoti/zighbKt/jupuxitapesafu.pdfIn PDF document text
    • https://gamajebijapam.weebly.com/uploads/1/3/1/8/131856653/5434926.pdfIn PDF document text
    • https://funotagikaxu.weebly.com/uploads/1/3/1/8/131857914/wonidunas-kolijowuwobasuv-gowupagabifaxap-taliduden.pdfIn PDF document text
    • https://cdn.sqhk.co/litawoxelida/bihdhey/95019741481.pdfIn PDF document text
    • https://cdn.sqhk.co/lufasawo/hhbiifO/materialismo_espiritual.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/U2hbYA2/pinixelovuzatep.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/jaifhhS/44943054539.pdfIn PDF document text
    • https://cdn.sqhk.co/derepinejabi/iesjbhj/29849445838.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/hjeRgiE/piano_coffin_dance_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/muzolorakow/ehjkgg1/disney_baby_lullaby_songs_lyrics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/jiropik.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/thetford_c200cs_cassette_toilet_manual.pdfIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_64866d819eda478e85ee0bbc05986eec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42c5012d-b82b-4872-a20d-c53c0c0cc4ae/what_should_i_put_in_my_time_capsule.pdfIn PDF document text
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_091dfc82c3c943ae94a0a96a45f74641.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cc20deb-6f8d-435c-8b86-af5117048c2d/88468964454.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/personal_trainer_cv_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2528e89f-2245-4e67-83ef-e75457971a56/natogage.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/dedetisezafewilija.pdfIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_895a110ea88e499386752b8256d457a2.pdf?index=trueIn 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_off0000e483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 5608 bytes
SHA-256: aaa7d9e6db2c4b7a4e4849355335202edca0be0db3efe632d7661693558f95e8
font_01_sfnt_off0000f793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 12004 bytes
SHA-256: c6ff3719490c9551368201f909b7fb14fb222c1bf1e6e80cd541d47ab5923c59