Malicious PDF — malware analysis report

Static analysis result for SHA-256 71183eb1bb4a92a7…

MALICIOUS

PDF

69.7 KB Created: 2021-03-01 01:24:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 994378aec2857f1cd05a889566ae292d SHA-1: 47a7afd4be565a559eaedcb3dfd9d08ef123b95c SHA-256: 71183eb1bb4a92a78e8b066c955f1986ff1b601e2e4ca314fad4e6e853c28a09
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF document contains numerous embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to replacing a cartridge, suggesting a lure to trick users into clicking malicious links. The presence of a link farm and the ML classifier's high confidence score further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://dafemum.ru/strik?utm_term=replace+sloan+flushmate+cartridge In PDF document text
    • http://fasad-dom.site/nfl_news_scores2ap0o.pdfIn PDF document text
    • https://tunorikiwevog.weebly.com/uploads/1/3/4/0/134097136/0857432bc3a.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/96841100941.pdfIn PDF document text
    • https://pakefipeve.weebly.com/uploads/1/3/4/0/134017053/figogujovafufun.pdfIn PDF document text
    • http://phrensy.co/best_android_wifi_booster_2018f17n7.pdfIn PDF document text
    • http://itasummer.fun/44753784663q0h4m.pdfIn PDF document text
    • https://malekijewa.weebly.com/uploads/1/3/0/8/130813883/kopiguvajomitik.pdfIn PDF document text
    • https://vojisijekedix.weebly.com/uploads/1/3/5/3/135311469/jewolaguwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501198/normal_5fce706a27d85.pdfIn PDF document text
    • https://vebodejivab.weebly.com/uploads/1/3/2/3/132302978/zunevakoxi.pdfIn PDF document text
    • http://dafagaketa.sportsontheweb.net/81356607754.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://fowimifefezujo.myartsonline.com/34826957504.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/rulanosozowedejo.pdfIn PDF document text
    • http://baletax.onlinewebshop.net/kopun.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC758 5460 bytes
SHA-256: c02b4e4c18222f77d14f587acae79d768746dcfa08f7d4c970fc4ad937ab15b9
font_01_sfnt_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 10012 bytes
SHA-256: 5c6f8765bd50839bad6d67f5e8e8299029953220edb9472490026f8df6f2e435
font_02_sfnt_off0000fbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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