Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2d4cb8335c2438…

MALICIOUS

PDF

67.4 KB Created: 2020-11-14 17:18:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 26c8e870060412314e3994d77bdb205b SHA-1: d8f41c1d4f8d15ce64bddad2e35b3ef3a986f202 SHA-256: 7c2d4cb8335c2438cd63c8bd19798cab53accc87c4bcb20fb799e7d627f64203
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffset.ru/strik?utm_term=together+with+ead+accountancy+class+12+solutions+pdf PDF link annotation
    • https://bugadubotureje.weebly.com/uploads/1/3/4/4/134468403/b1c9bc0e8d0b989.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379053/normal_5f8ef8c4688b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376619/normal_5f9afe580c2c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412894/normal_5fabc2aa42d78.pdfIn PDF document text
    • https://jajedasas.weebly.com/uploads/1/3/4/2/134234666/5627789.pdfIn PDF document text
    • https://wuzubetimu.weebly.com/uploads/1/3/4/2/134266391/fozoxa-jofopij-vifutisedobu-nedit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368251/normal_5f88510bf35eb.pdfIn PDF document text
    • https://vibitaxipeni.weebly.com/uploads/1/3/4/5/134526550/5194579.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/vufupu/dajasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e98d0def-4792-4662-844f-69feeb22f43e/80740149693.pdfIn PDF document text
    • https://s3.amazonaws.com/bunobu/fedatige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcd98e61-e96c-4ba0-a321-09e9f613f829/highlightskids_com_hidden_pictures_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_off0000c90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90E 5744 bytes
SHA-256: 1db36d85a7b9c45c3325282e5712421ddb91d15ce726165e8cf6f635b5dd8f4e
font_01_sfnt_off0000dcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBC 10384 bytes
SHA-256: 9a5b83b19cc52aa48dae8ce6c3671eb230be6074a65ace7d1b98a91cd4eae814

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