Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c8374ff1ad13c7…

MALICIOUS

PDF

70.0 KB Created: 2020-12-24 04:19:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 052279a2d8eef7d1ba04e06d3e7685b7 SHA-1: 594a32b0332ab24bd1d85659f40ddf9c6414bc3b SHA-256: 41c8374ff1ad13c750be49cd78c1319cb6fe2ff0c4c3f34ab61c0a281aff3fbf
214 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link farm and a phishing trojan. The PDF contains a significant number of embedded URLs, with one pointing to known malicious redirector infrastructure. While no scripts were extracted, the presence of numerous external links suggests an attempt to lure users to potentially harmful content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/strik?utm_term=the+difference+football+trainer
    • https://xidalivukudupet.weebly.com/uploads/1/3/4/3/134319957/sokikizitaguw-jefikaropegove-jimuvoj.pdf
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/sutubotelev.pdf
    • https://gadebalemalun.weebly.com/uploads/1/3/4/4/134443756/rimapeso_foxemosuzuwul_verij_woxarinajijavo.pdf
    • https://kavaxaxogemiren.weebly.com/uploads/1/3/4/4/134441995/polanu.pdf
    • https://zazukorowoko.weebly.com/uploads/1/3/4/4/134488568/adc058f3.pdf
    • https://retujofidevi.weebly.com/uploads/1/3/4/6/134621577/7345358.pdf
    • https://gabonavokelog.weebly.com/uploads/1/3/4/6/134684269/490a6e5067f42ce.pdf
    • https://fafefojesuvun.weebly.com/uploads/1/3/4/6/134651362/fesakumobajuwazis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bbabe8a8-c696-46f7-867a-42b103753c03/knockout_bowling_alley.pdf
    • https://s3.amazonaws.com/wovisak/gradle_test_report_configuration.pdf
    • https://uploads.strikinglycdn.com/files/243df991-c8f2-44b4-b160-1ea5c7b32e49/tefoxawodimawujesegitom.pdf
    • https://uploads.strikinglycdn.com/files/b4ff9363-7d5c-4731-b1fa-773cc31a8e95/72204752621.pdf
    • https://uploads.strikinglycdn.com/files/cbcb61fd-b422-4b56-ad65-dd554e925959/nick_cordero_blue_bloods_cast.pdf
    • https://uploads.strikinglycdn.com/files/4a031a72-2e76-464c-bc2b-de19edb430fd/identifying_complex_and_compound_sentences_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/a8450025-6395-4b9b-babe-0ea1b678e627/chess_openings_for_black.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d702.bin
856551f0b9d23c063154dbe6530928189b94a6e203bc65390fb8de7559a9b248		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 5020 bytes
font_01_sfnt_off0000e80d.bin
e9dcda36d54176c28ed5ef894c6d60cd3a66a32240fb6ac8f47c8304b9ea6ee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE80D 10248 bytes

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