Malicious PDF — malware analysis report

Static analysis result for SHA-256 9904b081c86309f6…

MALICIOUS

PDF

40.3 KB Created: 2020-11-08 17:05:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c76bbcc06855cc4b91dbc7e1c541eae5 SHA-1: 1fb0eb22ccc68be054e13804676c35cea9db2bf4 SHA-256: 9904b081c86309f6c424a768023b6b7908bddd9a4e4076d0e3e33cfe6390eb48
116 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document exhibits characteristics of a link farm or SEO manipulation scheme, containing a large number of external links. The presence of a callback phishing lure suggests an attempt to trick users into contacting a fraudulent support line or engaging in a scam. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content or engage them in social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://trafffi.ru/123?keyword=tv+guide+magazine+customer+phone+number PDF link annotation
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/rebodi.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/1379c011b15ad.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/gusixolatigovuzap.pdfIn PDF document text
    • https://numuluga.weebly.com/uploads/1/3/4/3/134307024/xutebalemasinom.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/jazuravazaguz/apj_abdul_kalam_quotes_in_bengali.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/evanescence_my_immortal_piano_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7de29d12-98b2-4c9f-a98b-2ce05523e04a/jinivifupad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1aff47d-8629-48f6-bf48-192ec3215b21/codigo_ascii_para_imprimir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51e09bcb-ea47-418b-a7ed-2174b6395fc9/wepafutuvakuvapesiwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09606eb3-05ed-43b1-b317-915a09464143/kabelumiwuvodadavawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f08fd83-ab3f-4c15-a285-fbe2c9c5325c/50475042610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f43324e-7796-4f1b-855e-1448f3e95cb8/rinirikimelufoxekagozole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/246998ef-f025-470f-8b26-c9940c0f891f/mebixinig.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_off00005dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBE 5656 bytes
SHA-256: 6526162dc39eda18f65992ecb68abdaf8684dc8c51f2e33e7712540bdadb656b
font_01_sfnt_off000070d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70D8 10440 bytes
SHA-256: a4121a4466e16cc1c8eb7f8495007b04e09acfaf8890c8b4497c2c15fda9618f

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