Malicious PDF — malware analysis report

Static analysis result for SHA-256 673fd5126d823186…

MALICIOUS

PDF

70.2 KB Created: 2021-02-13 01:10:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 01dadd890133a88a8be01cd29e2e3fad SHA-1: c3132d84cb705250ff951eae8fa3f35ac9907d80 SHA-256: 673fd5126d823186fa91bfc0940fa7363432c2fe1c260ca472cd6e9c2d83ffaf
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The embedded URLs suggest a phishing or scam attempt, likely aiming to redirect users to malicious content or download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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://crophysi.ru/aws?utm_term=definition+answered+prayers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375087/normal_6018a43bebedb.pdfIn PDF document text
    • https://cdn.sqhk.co/suxumeva/jfiQ2hi/7735487666.pdfIn PDF document text
    • https://cdn.sqhk.co/bawusipa/RrjjWjc/five_nights_at_freddy_s_2_demo_ext.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451049/normal_5ffb756c66361.pdfIn PDF document text
    • https://zemijawa.weebly.com/uploads/1/3/1/0/131070152/2235478.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417536/normal_5fcc18a8bc180.pdfIn PDF document text
    • https://vabuxijipureg.weebly.com/uploads/1/3/4/4/134476882/nolebajifewegereti.pdfIn PDF document text
    • https://cdn.sqhk.co/fidumugovoz/aU1giib/bexewefezoramonifisuvin.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/icjingf/gunumibozenisinumije.pdfIn PDF document text
    • https://cdn.sqhk.co/padixemugex/0ZCiagd/1914183482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390638/normal_601b6fee7bce6.pdfIn PDF document text
    • http://gigedela.iblogger.org/98983585983.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://makidibe.epizy.com/reactions_of_cycloalkenes.pdfIn PDF document text
    • http://laropijodozu.epizy.com/badagidodetemolekadepo.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_off0000d267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD267 5196 bytes
SHA-256: e1d6e6baeb47fe015f92bbf746528c347dad003234a395bae844100f4e4f699b
font_01_sfnt_off0000e443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE443 11552 bytes
SHA-256: 7946bfa8b3d41056d3dae7c56b1a470442fc6fbad6dfe3f4016d2bfba48d4d2d

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