Malicious PDF — malware analysis report

Static analysis result for SHA-256 568d332549671396…

MALICIOUS

PDF

76.2 KB Created: 2021-05-19 12:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b44fe36ed5663575e6b813081832dda9 SHA-1: 822844eaa697847d0b0725dc580be79e312fa436 SHA-256: 568d332549671396f25238d503becbf78e4e01786919bfdcbed6acccd4114865
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to serial numbers and software, suggesting a phishing lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent, likely to redirect users to a compromised site for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=serial+number+nuance+pdf+converter+professional+7
    • https://cdn-cms.f-static.net/uploads/4486359/normal_6057958abe0e2.pdf
    • https://cdn-cms.f-static.net/uploads/4409258/normal_604cfa319a8ac.pdf
    • https://bezodidamivozel.weebly.com/uploads/1/3/2/6/132683328/pobiwa_xumude_lutixuxanudo.pdf
    • https://debagodijif.weebly.com/uploads/1/3/0/9/130969595/5507444.pdf
    • https://lerorenoj.weebly.com/uploads/1/3/5/3/135390996/sawire.pdf
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/mezijewem-pijalikuk-juvitasu-vozofazenena.pdf
    • https://fozixaxo.weebly.com/uploads/1/3/4/6/134665632/bofosiwunodakak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gapuruxumeg/xawaziwopujavezekopazap.pdf
    • https://uploads.strikinglycdn.com/files/58ba1ce5-b7eb-4233-beed-f7ad92d52e67/41791306335.pdf
    • https://s3.amazonaws.com/nitizobuv/femubevobosovonutexekage.pdf
    • https://s3.amazonaws.com/tugafebip/islamic_baby_boy_names_with_meaning.pdf
    • https://uploads.strikinglycdn.com/files/8a96b6a7-9140-4fa9-992d-eacbcd4e0252/how_to_teach_effective_writing_skills.pdf
    • https://uploads.strikinglycdn.com/files/7b3c47b4-f219-4a2a-9878-83c0774b44ef/how_to_make_a_table_with_metal_legs.pdf
    • https://s3.amazonaws.com/lorerexeg/quadratic_equation_solver_vertex_form.pdf
    • https://uploads.strikinglycdn.com/files/2e8081ba-12df-4b75-a551-559f939e9a40/gozafolexivo.pdf
    • https://s3.amazonaws.com/wajibile/does_shadow_work.pdf
    • https://s3.amazonaws.com/venunamazozuzo/kazifo.pdf
    • https://s3.amazonaws.com/bulikowexunepov/maytag_neptune_washer_loud_spin_cycle_noise.pdf
    • https://s3.amazonaws.com/tobovunoberiki/78958137468.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb50.bin
d18df7feb1816ba57429fed38ab5fea4b664acf58bedf3b3381fcc481797e409		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB50 5684 bytes
font_01_sfnt_off0000fe92.bin
f9b788e66e4a8ec379d7744176c7b0c4c9c0dd58923d6e87c0d1bcb228cb0a9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 10744 bytes

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