Malicious PDF — malware analysis report

Static analysis result for SHA-256 4534beb31ce87869…

MALICIOUS

PDF

76.3 KB Created: 2021-02-24 20:51:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d2d6724b19d07a69a7618fd7cce4095f SHA-1: 477c9b6220ea77fea5ebbe0d656a7b9203158b21 SHA-256: 4534beb31ce87869feb979bc036ea89d12f1472cc7103718f2512e8600bb401c
186 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content, likely for phishing or malware delivery.

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://druttle.ru/award?keyword=how+to+get+foster+certified PDF link annotation
    • https://cdn.sqhk.co/nufomewo/iahf9jc/el_arte_de_la_guerra_scribd.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/gCwjaqg/57024426292.pdfIn PDF document text
    • http://romeital.space/dubirijimukedapekidalitud44ms.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/kicg6jd/chess_rush_tier_list_august.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxonavi/ihjhue9/44253163337.pdfIn PDF document text
    • http://ecoterritory.store/25523303112g7tmb.pdfIn PDF document text
    • https://cdn.sqhk.co/duzemata/7EOjfic/woxasopiwodinopaxarevoro.pdfIn PDF document text
    • https://cdn.sqhk.co/voguzasijur/iij3pMj/29168925728.pdfIn PDF document text
    • http://islemleriniz.org/are_ariston_appliances_any_goodkdd8w.pdfIn PDF document text
    • https://fokurojisek.weebly.com/uploads/1/3/1/4/131438639/1ca6117.pdfIn PDF document text
    • http://bcipreactivaperu.com/88383512928c4qom.pdfIn PDF document text
    • http://freshnatur.fun/traditional_costing_system_vs_abcxyr99.pdfIn PDF document text
    • http://kengoru.space/125387241069gc69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64F 4684 bytes
SHA-256: a91ef87d53a24e8883dbe1c634799fb3a921e93337a44d497f9d17e929a573ff
font_01_sfnt_off0000f664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 10404 bytes
SHA-256: 3491c05429d8198f26c8c08640408636c015eeeb807751a607eb83e03e2c3ac8
font_02_sfnt_off000119ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FF 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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