Malicious PDF — malware analysis report

Static analysis result for SHA-256 1579636f606bfd88…

MALICIOUS

PDF

68.8 KB Created: 2021-01-05 19:10:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 452a0f8e0d437a6bb2af0c8037aca9bb SHA-1: 1c5ba66753e5523987c807e240a75ac98585a83a SHA-256: 1579636f606bfd88b32a5ecada5d5dc304370175199da8ba380d92e4f6597a13
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

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://trafficel.ru/123?utm_term=concept+paper+sample+pdf+philippines PDF link annotation
    • https://ramorebuba.weebly.com/uploads/1/3/4/8/134898890/05439.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/Ehjcehj/android_games_zombie_tsunami_free_download.pdfIn PDF document text
    • https://murusezikarif.weebly.com/uploads/1/3/4/4/134436274/a1feaaae8939.pdfIn PDF document text
    • https://cdn.sqhk.co/fafovewidom/iaSiYH0/442022196.pdfIn PDF document text
    • https://sevozinevuzejok.weebly.com/uploads/1/3/4/9/134903388/xavamejanad-zigikafivowezi.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/ciegdig/zombie_assault_game_3d_shooting_games_offline_pc.pdfIn PDF document text
    • https://kenibuxe.weebly.com/uploads/1/3/4/6/134688639/9796111.pdfIn PDF document text
    • https://ruparowix.weebly.com/uploads/1/3/4/3/134350000/95e9414c682226.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/ehbELwU/45769161074.pdfIn PDF document text
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/2605690.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/5650151.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/fewunadupop/admission_form_for_school_2020-_21.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AE 5300 bytes
SHA-256: 6f399d26a0d49c05c4a19d965d3a38df585e0cec27d7d5327a34df379a7dcb43
font_01_sfnt_off0000e485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE485 9964 bytes
SHA-256: a384a1c64943a6efacaf9e713cab2d3a24d11a27215423b79487494d74001738

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