Malicious PDF — malware analysis report

Static analysis result for SHA-256 31802c1ba47c29f0…

MALICIOUS

PDF

94.2 KB Created: 2021-03-23 07:27:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e03397063946df533117d2b9b0409e0a SHA-1: a8005c7f2d0278945ae2205737ba1b055c6f765d SHA-256: 31802c1ba47c29f0c230d7f5e6a8fd95e17b90c2342b7a5b191168966b60609d
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, which is characteristic of SEO manipulation or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious content, aligning with spearphishing attachment tactics.

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
  • 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://vilenefex.ru/123?utm_term=calibri+semibold+font+free PDF link annotation
    • https://cdn.sqhk.co/sorubajuzoxe/RmhgIge/2214460638.pdfIn PDF document text
    • https://fupefodomixeja.weebly.com/uploads/1/3/4/8/134889506/c142a6d626.pdfIn PDF document text
    • https://cdn.sqhk.co/mojupesonon/hjslehj/20533477445.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/RxKifgd/best_screen_recorder_app_for_samsung.pdfIn PDF document text
    • https://cdn.sqhk.co/livejizilul/ifgguij/brahmanda_nayagan_movie_free.pdfIn PDF document text
    • http://politach.com/livusutoloravumefelasektmscn.pdfIn PDF document text
    • https://tagosijotibaza.weebly.com/uploads/1/3/1/4/131407106/dejibopu.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/NiaTdoo/89523300981.pdfIn PDF document text
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/wenosogufekovux-kukugezig-mosuf.pdfIn PDF document text
    • http://kefets.xyz/how_to_prime_a_hotsy_pressure_washerkvvgi.pdfIn PDF document text
    • http://lojuxaga.mywebcommunity.org/dorero.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/e641adc6-2047-4baf-bbaa-4f6cc376236a/kixotevadaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e395d61-37ea-4fe5-a5af-c10195bc2323/duparikujimonel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b56d491d-3f5e-4744-9c4e-0075937d24c3/89551684116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/485a80fa-f1e4-4c85-839c-a0543ac0bbb2/what_amp_fuse_for_minn_kota_trolling_motor.pdfIn PDF document text
    • http://fepetixapokurob.myartsonline.com/tifiwonigirotivalakem.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_off0001340a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340A 5096 bytes
SHA-256: 1d70189e77b41822c7791684e7e289f89f0f1e57da63556c2e298999f59ffeb4
font_01_sfnt_off0001453e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453E 11508 bytes
SHA-256: e5832bcacf4761045d34aaf814d636de5228637f58462be6ed4db1f2a386c8d8

Open this report in the interactive analyzer, or submit your own file for analysis.