Malicious PDF — malware analysis report

Static analysis result for SHA-256 8042db51f135316f…

MALICIOUS

PDF

74.8 KB Created: 2021-03-04 16:35:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bf6af63b98fcf5f64ef9cc6e769be57b SHA-1: da3bdeebea36911b651d8c8d46761337346fd278 SHA-256: 8042db51f135316f4e1b09c28c81a441807bab5db093ab504a957c098138ffee
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, references a 'Jerry Kuhnhausen 1911 shop manual', likely a lure to direct users to the malicious URL.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/strik?utm_term=jerry+kuhnhausen+1911+shop+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462344/normal_5ffd245a348ac.pdfIn PDF document text
    • https://jizenifujepuv.weebly.com/uploads/1/3/4/4/134489688/pogibujejige.pdfIn PDF document text
    • http://linudanozuno.iblogger.org/medical_check_up_form_for_canada_visa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462681/normal_5fff129945581.pdfIn PDF document text
    • https://gilabekavug.weebly.com/uploads/1/3/4/5/134597011/gagej.pdfIn PDF document text
    • https://napuximijagebi.weebly.com/uploads/1/3/4/7/134766840/d18051fb5cee.pdfIn PDF document text
    • https://dapazigozasonim.weebly.com/uploads/1/3/4/4/134466252/kugajiminofejop_kulitolupape_rubemivutonuku_podisofaj.pdfIn PDF document text
    • http://momelekunizu.22web.org/zijidebizute.pdfIn PDF document text
    • https://viluxesoxumubi.weebly.com/uploads/1/3/1/4/131406714/dawowuzikumerifu.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://s3.amazonaws.com/fokapikow/mobebog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b1fa49-5c7f-47cd-803b-6b71e1a8d38d/ponniyin_selvan_movie_first_look_hd.pdfIn PDF document text
    • http://nufejubonuviwo.epizy.com/69287313009.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/cerere_eliberare_pasaport_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/38946993932.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/blackshot_game_free.pdfIn PDF document text
    • http://pugorenorow.epizy.com/adyaksha_adhyaksha_adhyaksha_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/765320de-7622-4523-99c7-ca5098c1eaa9/whirlpool_thin_twin.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/doraemon_movie_in_tamilrockers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5db8362-0e3d-401a-a98d-a2e90d4cfbaa/microsoft_office_project_download_free_2010.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_off0000d872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD872 5176 bytes
SHA-256: 0c388665bc97a9e8a44bf35c4c291bc6422406e750f2e0ab492db32d4b2caf36
font_01_sfnt_off0000e9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DA 11336 bytes
SHA-256: 48106d4a7d5ed0a7e0a223df458103a47e72a5a00e808635283d05196de91254
font_02_sfnt_off00010fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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