Malicious PDF — malware analysis report

Static analysis result for SHA-256 c603ac5e10342cd6…

MALICIOUS

PDF

78.4 KB Created: 2021-01-08 18:00:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6ba8b9e7acb80cd966f7b948889c2ec6 SHA-1: 7460f96cf6bb8667f1d8374bd064a4f87352c853 SHA-256: c603ac5e10342cd650e5785706800b6af24da01dea483c480647cc16fdae0ab4
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to known malicious redirectors or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://cctraff.ru/aws?utm_term=combining+data+from+multiple+sheets+excel+2010 In PDF document text
    • https://sudusiwigi.weebly.com/uploads/1/3/1/0/131069987/raradufalowokirolivo.pdfIn PDF document text
    • https://cdn.sqhk.co/kitijorawul/04Wjzy5/fajomifomuginisebab.pdfIn PDF document text
    • https://jozinuzo.weebly.com/uploads/1/3/2/7/132712000/poxedosuxew.pdfIn PDF document text
    • https://gujojiri.weebly.com/uploads/1/3/4/4/134434224/gubulamukefifajemib.pdfIn PDF document text
    • https://rapusixub.weebly.com/uploads/1/3/4/6/134631860/699b2dff37bb.pdfIn PDF document text
    • https://cdn.sqhk.co/xezojutatow/ijihghb/touchdown_master_cheats.pdfIn PDF document text
    • https://somotudodij.weebly.com/uploads/1/3/4/6/134699902/japufibesajila-xudexitiw-vadebizejevov-busimapave.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/ganubifirigevi/word_cookies_2_answers_apricot_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9e83fe7-dd07-4a32-b3e4-d9e4c87e1b26/48172226192.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/blue_iguana_care_sheet_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a9442c-4f3a-4bdd-a56c-8cccf67f320a/64508081343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/706565c2-10a4-4b32-aa1b-5195fe9e0bb7/8922014324.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/unblocked_games_77_dream_car_racing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9001b1f3-18c8-41ac-831d-491ddd749f6f/95638188409.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/metal_gear_solid_4_game_informer_review.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_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 6008 bytes
SHA-256: 5831e1f30c248102749c2f22b5fe865a931cd9daea4a98158aa1a1706d661e5d
font_01_sfnt_off00010835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10835 10568 bytes
SHA-256: c6e6eb5e5b486f0c4fd7bee5bf1c91eaf508dfb7a67f0f307667cdd1f568bcdc

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