Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd8e90cc5af0e1c…

MALICIOUS

PDF

69.2 KB Created: 2021-02-24 01:38:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 255cacbb59e0dddc777cdf61541f7092 SHA-1: cef87a6eae38242d3849e84b093769bde6ed25a8 SHA-256: bdd8e90cc5af0e1cadcd0c302c61fb07d6a0bd347202bbb33ce3255e2e3b5a83
244 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous external links, many of which point to disposable hosting services. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were directly extracted, the presence of embedded URLs and the overall structure strongly suggest an attempt to lure users to malicious websites, potentially for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=5e+steeder+stat+block In PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/33ac8534ff2.pdfIn PDF document text
    • https://giwuvapelefawi.weebly.com/uploads/1/3/4/8/134869604/578869.pdfIn PDF document text
    • https://dapiridefurewej.weebly.com/uploads/1/3/5/9/135987432/fupigoza.pdfIn PDF document text
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/b1afa8b3d5f3e.pdfIn PDF document text
    • https://zukigepuzena.weebly.com/uploads/1/3/4/5/134593101/xejit.pdfIn PDF document text
    • https://webenewosa.weebly.com/uploads/1/3/1/4/131409170/lejudutidav.pdfIn PDF document text
    • https://datedevob.weebly.com/uploads/1/3/1/3/131381982/b97b6e4.pdfIn PDF document text
    • https://jamibada.weebly.com/uploads/1/3/1/1/131164428/1bb8d172ed.pdfIn PDF document text
    • https://xajakubadom.weebly.com/uploads/1/3/0/8/130874473/1251741.pdfIn PDF document text
    • https://danivuvi.weebly.com/uploads/1/3/1/4/131407625/9074632.pdfIn PDF document text
    • https://lulotabo.weebly.com/uploads/1/3/4/7/134745182/8150851.pdfIn PDF document text
    • https://wosapinilesodiw.weebly.com/uploads/1/3/5/3/135347506/bobivura.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/sewamos/99831139086.pdfIn PDF document text
    • http://fusuzuveraku.epizy.com/ludowe.pdfIn PDF document text
    • http://zubeleboju.epizy.com/medical_fitness_certificate_for_college.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/original_gangster_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/can_i_travel_to_california_with_my_ar-15.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_off0000d2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E9 5168 bytes
SHA-256: 6438d35e350530434ba11a4145b1309cc62b9c450b4ac48e4956b0866e21cf8b
font_01_sfnt_off0000e486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE486 10500 bytes
SHA-256: 150cc57516c945adfb49a0efa30c2306fee47fcb4943a060e33de8f573d5b547

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