Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb0716054a19517…

MALICIOUS

PDF

65.3 KB Created: 2021-01-04 21:12:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ae8b4cc2329d6826af821a3beb2d55ae SHA-1: 4e6181a70125542e249b38c067a788c731eacabb SHA-256: cdb0716054a19517af6fd95899e3af2f114617404df8262cd07e1659a13e1e2e
234 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://ggtraff.ru/123?utm_term=johnson+county+vehicle+registration+olathe In PDF document text
    • https://vofepelatuj.weebly.com/uploads/1/3/4/7/134768647/154168.pdfIn PDF document text
    • https://cdn.sqhk.co/zedawuzijis/12rIaJg/fepeguzefizazape.pdfIn PDF document text
    • https://denijebif.weebly.com/uploads/1/3/4/5/134584122/ganetov-pexiregiru.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/7573277.pdfIn PDF document text
    • https://wudonazig.weebly.com/uploads/1/3/4/6/134675044/8413279.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/leguvefu/sonoxigitan.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/31854728749.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/roblox_piano_sheets_undertale_copy_and_paste.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/93631935573.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/nodaway_valley_high_school_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/vefotatesakewubirosabesu.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_off0000c1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FD 5212 bytes
SHA-256: fc021acccc8e28c55a17c0d162313ded53e6309f7cdb385e9a074ccfe1fa84be
font_01_sfnt_off0000d3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C2 10724 bytes
SHA-256: 67f0d8abaeb2fde1d61339eb340db0c797f6b671c6617262573438d83ac1005b

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