Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb11fe8778392c08…

MALICIOUS

PDF

91.4 KB Created: 2021-01-04 15:57:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5a5b081f85229d87f66ab71e5b3e0897 SHA-1: 4e2c524e3eb60712c2873621f80ecded28850027 SHA-256: fb11fe8778392c08718665e4c6860cae6fdb8573cd785c6c256620a4613c1565
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'gettraff.ru'. The document body, though heavily obfuscated, contains text related to 'The munich manual of demonic magic download', suggesting a lure. The presence of numerous external PDF links, identified by the PDF_SEO_LINK_FARM heuristic, further indicates an attempt to distribute malicious content or engage in link farming. ClamAV also detected this as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gettraff.ru/123?utm_term=the+munich+manual+of+demonic+magic+download In PDF document text
    • https://bawapumur.weebly.com/uploads/1/3/4/4/134466187/sazorodubozojik.pdfIn PDF document text
    • https://narimokilef.weebly.com/uploads/1/3/4/6/134603618/fukilaz_pozojuguxuxe_dixugumasapa_jiruw.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/6612368.pdfIn PDF document text
    • https://cdn.sqhk.co/sugifila/BhjPMp7/do_you_want_to_play_tennis_in_french.pdfIn PDF document text
    • https://niwubeleligijoz.weebly.com/uploads/1/3/4/7/134764474/wolitixaruwefat.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/Lg6jaSX/xopawinezebaxufozaj.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/4e4628a7-bf3f-4331-b4bd-dc629c855bb8/holly_holm_germaine_de_randamie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b2f740f-09f2-411d-b63c-78540ca810be/parti_colored_pomeranians.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/94793309888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd202e96-3859-478d-b10c-aadc89cb7ae5/morokirugijukos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af7555e1-bdde-42c4-ae65-075c39d20d00/slap_sound_effect_ringtone_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea2ea016-5eac-48af-a362-617f98742d17/subject_and_object_pronoun_worksheet.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_off000120c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C0 5200 bytes
SHA-256: 2b9af139a7b0afff9b8f8fd763ec5f04badaca8d07f5672da24bdda7b99c9191
font_01_sfnt_off00013260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13260 15196 bytes
SHA-256: 610f0d644aed3c1e3ddf91ed67f78d61e9d04a6fe6b10fa7037c75808b72fd61

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