Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfc321503e5bee7…

MALICIOUS

PDF

86.8 KB Created: 2021-05-10 19:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1fe6e59b75d7f09cc3d5ea027b45ae74 SHA-1: c84fd3b6a81f0c9841ace161c5fd98a9da88d4bf SHA-256: cdfc321503e5bee7335bfd35401073e119cbcd75e172ae926cbc509a06d41678
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://vilenefex.ru/strik?utm_term=yamaha+dgx-660+costco PDF link annotation
    • https://lopekemin.weebly.com/uploads/1/3/4/6/134628767/9511270.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/ahivZKX/dungeon_keeper_gold_pl_download.pdfIn PDF document text
    • https://niniteju.weebly.com/uploads/1/3/0/8/130814631/senoloxujige.pdfIn PDF document text
    • https://wovorixikamaso.weebly.com/uploads/1/3/1/3/131378932/kuwoku.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/hdhiid8/my_dolphin_show_7_poki.pdfIn PDF document text
    • https://porovepo.weebly.com/uploads/1/3/4/5/134527374/0de66f9be2e6f.pdfIn PDF document text
    • https://cdn.sqhk.co/puvelumilum/aHkLvid/clicker_heroes_hack_code_2020.pdfIn PDF document text
    • http://wikuseweluwi.iblogger.org/tobemewaxupukosez.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://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_d7d4b8c749e1406392981c40e2d0d211.pdf?index=trueIn PDF document text
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_448a9cd664a94588a062482dc33cbbc4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0ca86dd-a062-4463-a989-add3cacce6a1/what_is_the_commonest_word_in_the_bible.pdfIn PDF document text
    • http://nebiviteg.rf.gd/signe_cabalistique.pdfIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_b3f769f68afe48ec8a1b436fbe3b6a2f.pdf?index=trueIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_87be4b853faa4f1c8284ee3d4382b78d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5db74cd1-998d-4e17-b6e4-2d9acf7d5794/98534378464.pdfIn PDF document text
    • http://mazogatu.epizy.com/what_is_another_word_for_best_practices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51c1806e-6efb-4799-8a54-511a9621da39/61451229841.pdfIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_7e9dbdb015424b92be30c69def044430.pdf?index=trueIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_24fcaa48d86e41c29d3fa999a1884259.pdf?index=trueIn PDF document text
    • http://pekurixapomasil.epizy.com/dusosiwarixabarixidim.pdfIn PDF document text
    • https://c69a8150-bb1e-4c46-878b-fc1622391bd7.filesusr.com/ugd/cf91d6_83fb779f66fd4f4ea2449b271c530e1d.pdf?index=trueIn 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_off00010835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10835 5100 bytes
SHA-256: 868accadc35a64767e99fbf28e8ca7a01bdaa39bca936e9ee9eb69419e04ed48
font_01_sfnt_off00011994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11994 11240 bytes
SHA-256: 9435d27c3167d447bc1927268d2995c63793ec7bb20edbd1efd13ee67263107b
font_02_sfnt_off00013ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF4 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361