Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f746cc74888a6a7…

MALICIOUS

PDF

77.7 KB Created: 2021-05-24 05:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 50d7acbe4aef3d29bfb8a6cfe6965e4b SHA-1: 5b374e6c3af21fb645dc2c85a5f63607e6fd6956 SHA-256: 4f746cc74888a6a791ed10e067cca6cc624e110034678f16c8890a8d8470bf82
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external PDF links, including one pointing to 'jumiwimov.ru', suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to a graphic novel, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://jumiwimov.ru/strik?utm_term=five+nights+at+freddy%2527s+the+silver+eyes+graphic+novel+pdf+free PDF link annotation
    • https://semanipiji.weebly.com/uploads/1/3/5/3/135312460/tunuku.pdfIn PDF document text
    • https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/mulafes.pdfIn PDF document text
    • https://kalodobig.weebly.com/uploads/1/3/4/4/134432105/rikuwenijabiw.pdfIn PDF document text
    • https://zutijuxugovoxi.weebly.com/uploads/1/3/4/6/134684331/denafebizone.pdfIn PDF document text
    • https://gajerekore.weebly.com/uploads/1/3/5/3/135327587/wumojisag.pdfIn PDF document text
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/1900.pdfIn PDF document text
    • https://pafolerasakuj.weebly.com/uploads/1/3/1/4/131438226/8370624.pdfIn PDF document text
    • https://wifevotus.weebly.com/uploads/1/3/4/8/134897576/4058348.pdfIn PDF document text
    • https://nifatukipukixe.weebly.com/uploads/1/3/1/3/131398430/nepurumovuxixam.pdfIn PDF document text
    • https://neveloso.weebly.com/uploads/1/3/1/4/131408616/fuxoze.pdfIn PDF document text
    • https://sinekagu.weebly.com/uploads/1/3/4/8/134855021/3341759.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9e01547c-9452-4843-b808-c280d42eb7db/how_to_calculate_blood_sugar_from_a1c.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/boosie_badazz_new_album_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/plastic_sheet_manufacturing_companies_in_uae.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/tom_clancys_rainbow_six_quarantine_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/41775483670.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/58437043678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a852f52a-3825-4785-81ac-0d472970892e/39610061018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd27edae-9fba-430f-b128-3a94c97a5e15/python_gui_examples_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f687b1a5-fc07-40c2-bd80-c828654ce053/44569563547.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/war_of_the_worlds_2005_tripod_types.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d1b156-cb57-46aa-ae3b-a85dc65e972f/problemas_de_matematicas_para_cuarto_de_primaria_resueltos.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/disneyland_map_2020.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 5356 bytes
SHA-256: e1859825334efd1f768e76d4aa5232ea648d02d97f5c6c4bcaab13e2c58b8369
font_01_sfnt_off0000f1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C5 12304 bytes
SHA-256: a9f47a47a1ae1988f6bbc13eb32fc1ac2d106eea665da24d558ceb1633baaef4
font_02_sfnt_off00011882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11882 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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