Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a45d3cdb458bcf5…

MALICIOUS

PDF

73.9 KB Created: 2021-02-15 20:19:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 25a9bf0c6b7542b97c9f96d6ab662c38 SHA-1: cf84da16bed3727a4d33ff1b83dd863fcc9eef7a SHA-256: 0a45d3cdb458bcf5445716910a594fe5ec4b4fd4740d91fed87f55d8420fe13b
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 hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation attack.

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/strik?utm_term=what+is+the+most+accurate+bible+translation+jeopardy PDF link annotation
    • https://cdn.sqhk.co/latosagax/uC1iadY/biker_mice_from_mars_2006_episode_28.pdfIn PDF document text
    • http://beststudent.space/gofojifidaec2y5.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/z8Ugdhd/world_cup_soccer_2026_host_cities.pdfIn PDF document text
    • https://venonaneguwar.weebly.com/uploads/1/3/5/3/135398509/d34a60e0.pdfIn PDF document text
    • http://evatopshop.xyz/sigelei_chronus_baby_manual0jbo0.pdfIn PDF document text
    • http://podjem2.club/331128367iex5f.pdfIn PDF document text
    • https://venevivoxeda.weebly.com/uploads/1/3/1/8/131857756/zapuv-penogev-zekeraseliwiku.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/8jf3CQK/sodebomoruz.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/ehggiwX/legitaruxotosad.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/b7yKijm/all_recharge_bill_payments_cashback_application.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sibesexewelemu.rf.gd/android_studio_logcat_filter_disappeared.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/mamogujozinokumapuliluwef.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/18947784862.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_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 5644 bytes
SHA-256: 22af98607a8f07cb2f6797922787c460995e043d6a92d68ebad427c03643990b
font_01_sfnt_off0000f5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 10912 bytes
SHA-256: f5a264974abac15b472ba4d4ec699a25bdc7a5b35a085f2ae603bc66d0da6a43

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