Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45af1979a81721d…

MALICIOUS

PDF

81.0 KB Created: 2021-02-07 01:48:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b2fd4ddb06f80511d90f043a63bdc946 SHA-1: 650ecbded46ba427b416d9ca72b29939a61e3754 SHA-256: a45af1979a81721df1fc961702a46e8b2cc06e7222ab2eff098b93f2b6d94c5a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, where the document likely prompts the user to call a number. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it may exploit PDF vulnerabilities or serve as a lure for further malicious activity. The presence of many external links, some pointing to potentially malicious domains, reinforces the phishing and scam-related attack pattern.

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.
  • 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.
  • 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://bologen.ru/wb?keyword=rental%20agreement%20ontario%20template PDF link annotation
    • https://pituluwo.weebly.com/uploads/1/3/1/4/131437949/duweraj-gifigaguxasamid-xigezesulaver-gigamidavaw.pdfIn PDF document text
    • http://prizinsta24.online/nibukereladizufififafagamyt9iw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403936/normal_5ff8526c39c18.pdfIn PDF document text
    • http://drenajkrasnodar.ru/96448616379zintg.pdfIn PDF document text
    • http://richteam.site/cgeit_exam_sample_questions0ud3l.pdfIn PDF document text
    • http://lomags.ru/83649318874a1y7o.pdfIn PDF document text
    • http://mstmail.space/xenifumovifawudenosea6ycc.pdfIn PDF document text
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/5669841.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462708/normal_5ffd378da6b69.pdfIn PDF document text
    • https://digagewopaloz.weebly.com/uploads/1/3/4/6/134634746/zepekezupazebuvupaj.pdfIn PDF document text
    • http://wrinklestiltskin.com/xawidumofupumaxetulaljm9w.pdfIn PDF document text
    • http://ital-tess.space/assistments_answer_keybu537.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/fefurorobumi/lifibigijoju.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/update_android_nougat_asus_zenfone_2.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/macroeconomics_olivier_blanchard_david_johnson.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/inequalities_practice_worksheet_with_answers.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_off0000ff48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF48 4968 bytes
SHA-256: 9cf9cb92c159bc2d0c1d5ccb60f9324a8dbf7e9e471a496d796f252e8e94d116
font_01_sfnt_off0001101e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101E 11256 bytes
SHA-256: 76cb8f4ed619e96eff39506acd206c9ca962f64bab69aed145e6fef6dc4b148e

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