Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f9f18de224477a…

MALICIOUS

PDF

91.1 KB Created: 2021-05-29 08:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 807d3abee188716baf857387d71a54bc SHA-1: 43e8a19e2fbf26bf086ffd7f43fbb5a3fb029542 SHA-256: 54f9f18de224477a8eb2dd4eb2f60c776c904c66863925a1daaece793d84647a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://xezojetit.ru/123?utm_term=glitter+wallpaper++for+mobile PDF link annotation
    • https://jajijonag.weebly.com/uploads/1/3/4/7/134762104/muxigiroj.pdfIn PDF document text
    • https://donedupefunesu.weebly.com/uploads/1/3/1/6/131607777/galodabax-sexiguwimisovi.pdfIn PDF document text
    • https://folimero.weebly.com/uploads/1/3/2/6/132695744/680632.pdfIn PDF document text
    • https://radoxawema.weebly.com/uploads/1/3/0/7/130738714/rixojebakujivare.pdfIn PDF document text
    • https://bupafenanibud.weebly.com/uploads/1/3/4/0/134042845/6992d.pdfIn PDF document text
    • https://puvovajol.weebly.com/uploads/1/3/4/0/134040332/mobidur.pdfIn PDF document text
    • https://xigukiburid.weebly.com/uploads/1/3/2/7/132741693/fefisetinakaw_mipepaliw_feserawudu_dizujir.pdfIn PDF document text
    • https://kaxobemux.weebly.com/uploads/1/3/4/6/134676595/terareledekova.pdfIn PDF document text
    • https://rakoroga.weebly.com/uploads/1/3/4/8/134887340/gunelu.pdfIn PDF document text
    • https://feselezoretun.weebly.com/uploads/1/3/4/6/134690260/9104194.pdfIn PDF document text
    • https://nogafuku.weebly.com/uploads/1/3/2/8/132815296/juguxunoki.pdfIn PDF document text
    • https://kojozoxilasa.weebly.com/uploads/1/3/5/3/135302893/xurazidavigeta-vizexoramefu-kakefizil.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/61c0bd65-03ab-46ad-86fb-d8b4e29100e3/lizifujidikaluvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6112f534-540b-4a03-8c47-ddd9255ef130/18080986447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbeacbaa-7907-491d-9e4a-585e2e1e4387/can_i_change_the_battery_in_my_dyson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6ef6262-4c71-44a8-82ce-0f92d256fe52/68131035369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c945d677-8664-40b7-8373-ddeab72b6709/12130619621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77fb9911-c9c7-4ace-bc0b-58728959fd2a/wall_mounted_wing_chun_dummy_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b54837ca-62a6-4765-bb05-d258593d4668/job_interview_questions_and_answers_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc1cead8-bdc9-48a2-b522-579ffc3fd250/80956043103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/541829f1-b55c-4204-8580-65e3d85c6ec1/red_rising_book_6_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/725cd9bc-f385-4639-a7d3-13dcd06e0c8d/zijalaritalibek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce23e236-5645-4788-ac64-19d185acacad/52051862549.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64c4a6c9-ed9f-4a5e-a302-6eb24ee5b452/reveries_of_a_solitary_walker_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e67c83-9df6-4c44-94d9-9af0403ef9bf/calories_in_boston_market_chicken_noodle_soup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a01520a-99bd-4eee-b4d9-82ddc465320d/line_6_bass_pod_xt_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e325145f-c135-4680-8b46-a24dc9320de9/95712996236.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_off000120b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 5132 bytes
SHA-256: e19be718427ff11eb416eb3d2709a729e765c020bbb4f716e4c2540b65d8732d
font_01_sfnt_off0001322b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322B 13976 bytes
SHA-256: 9eb59b6baf8ae86f92f547ba10a7124466be00da8897e7fb2091995a8101a9a9

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