Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3f4b31c09175b6…

MALICIOUS

PDF

75.3 KB Created: 2020-12-27 19:54:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 364cfce94c778d24ded992ae85dd5c8e SHA-1: 53a0e8a0fc9913e08f762da22d2434231cc7af06 SHA-256: fb3f4b31c09175b691e10e01bb8ef87d8ed19295e3a856ef6dfe205e5c7c753f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate it is acting as a link farm, likely to drive traffic to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to potentially harmful content, aligning with phishing or scam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/123?utm_term=world+history+chapter+14+section+2+questions In PDF document text
    • https://pepigapipewoma.weebly.com/uploads/1/3/4/0/134000130/1025295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383801/normal_5f959c36369f3.pdfIn PDF document text
    • https://joxiwawetesamiv.weebly.com/uploads/1/3/4/3/134306419/bupenepajolo-vagogimov-paritej.pdfIn PDF document text
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/3915027.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407747/normal_5f9cf95dbe0e5.pdfIn PDF document text
    • https://vazagivire.weebly.com/uploads/1/3/4/8/134874695/2644153.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/3c840056.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7e607b2-d136-4358-b6a5-6c11d5d8e065/sosekibezusaned.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d31a78cb-dcea-4d06-a9ed-d1ee5dff1f5e/hoover_windtunnel_2_rewind_pet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/557e5985-f01c-4264-b396-2d53627aa951/50836584813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/938a5e46-b94a-4904-b8bb-6c6b62b2155e/xexuwuvipavixiwetuxujawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3df23a5-1513-4280-895e-9efc4daf4c54/gumuxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a00cf89-8b3d-4388-8189-f6243e28e5e3/dell_inspiron_6400_drivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45466793-62be-49ef-bb93-a04479b34cdf/wovujasuzajuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b5c082e-9853-4a73-981d-7c53c3819f24/dutanepulufufejumesugakuz.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_off0000e63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 5672 bytes
SHA-256: 1ea042b073f12611551831a6f079ba4fc14f787996ee98e4a32682d5dbc5623f
font_01_sfnt_off0000f9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 11360 bytes
SHA-256: be50107fef329c57db87195454e6ea5765ca5f91cd68bc1a2c2646725dce0ab8

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