Malicious PDF — malware analysis report

Static analysis result for SHA-256 6238f79e9c28c085…

MALICIOUS

PDF

65.5 KB Created: 2021-01-16 14:39:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 08533bcefbecdc8d96a408452aba4284 SHA-1: 62676f3bcad2be55a9bba364c4c31f0ce5c2027a SHA-256: 6238f79e9c28c0854f9ec42d839bac67ba7166a7e506a4fc365e6ad9a90aaec3
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains multiple embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were extracted, the presence of numerous external links suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://traffnew.ru/123?utm_term=photosynthesis+worksheet+answer+key+pdf PDF link annotation
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/8d13f7c12f6cfa5.pdfIn PDF document text
    • https://fisolaxarod.weebly.com/uploads/1/3/4/4/134471724/17f0bb3f846c0d.pdfIn PDF document text
    • https://site-1173288.mozfiles.com/files/1173288/fekopetuw.pdfIn PDF document text
    • https://nawivavunof.weebly.com/uploads/1/3/4/6/134669961/7185980.pdfIn PDF document text
    • https://zaxefuki.weebly.com/uploads/1/3/5/2/135299090/dipijes-jumanaluge-fepabidat-roruloj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369777/normal_5fd5f99b11a16.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/evdjbii/pinball_fx3_free_tables_download.pdfIn PDF document text
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/mebuzufepisap.pdfIn PDF document text
    • https://jadegivi.weebly.com/uploads/1/3/4/8/134851053/xomedomolaruzorasum.pdfIn PDF document text
    • https://site-1171720.mozfiles.com/files/1171720/lawotemupogeloki.pdfIn PDF document text
    • https://sanokigoj.weebly.com/uploads/1/3/4/8/134863934/nulumowarenaje.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/tuxalowafokuvo/login_page_template_in_bootstrap_3.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_off0000c4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A3 5356 bytes
SHA-256: a1e2d57c423d51af6fa4b94918e48c7a459ab974bd6c844696967f72dbeace03
font_01_sfnt_off0000d6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EB 10008 bytes
SHA-256: 57a4a68dd193cd31c1625164eb6ea2400acc81cad03f2ae72cf90f18ae91f0a4

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