Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd24c78ac16af36c…

MALICIOUS

PDF

102.2 KB Created: 2021-05-17 01:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fd1858d3c88cf696800c3221523aaaa8 SHA-1: d3240befe43cb3f99a1f05d36714bb575db6e835 SHA-256: dd24c78ac16af36cc6c842dd7fff5538e8efaffb5cb476d03d18136a6a31a63a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, likely designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/strik?utm_term=icom+746+pro+manual PDF link annotation
    • https://nulokedebuzeb.weebly.com/uploads/1/3/4/3/134310318/95af124d7ccfe4.pdfIn PDF document text
    • http://sutiboju.sportsontheweb.net/wurofevosiwisuzano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471253/normal_5feb3ce29ffcf.pdfIn PDF document text
    • https://ritosameb.weebly.com/uploads/1/3/4/2/134266106/mobibu.pdfIn PDF document text
    • https://pipamoximiketo.weebly.com/uploads/1/3/0/9/130969724/7a1823f4783.pdfIn PDF document text
    • https://bupuzufemu.weebly.com/uploads/1/3/1/4/131452870/e76973753.pdfIn PDF document text
    • https://zasevolonuto.weebly.com/uploads/1/3/5/3/135335071/pibiniz.pdfIn PDF document text
    • http://jopagozopive.medianewsonline.com/burger_king_impossible_whopper_review.pdfIn PDF document text
    • https://wufewevaso.weebly.com/uploads/1/3/1/4/131453291/vejenemop.pdfIn PDF document text
    • https://bivedaniliged.weebly.com/uploads/1/3/4/7/134732971/dexaneviwamon.pdfIn PDF document text
    • https://dupubevanedi.weebly.com/uploads/1/3/4/6/134649007/lexepekuda.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/42f17beb-4a14-4e3f-b2e0-179c148b7c5d/poranina.pdfIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_9b0eb8182ef047b78e62975d14a5511e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d23827e-b977-4382-9773-6be0cddcf657/fender_mustang_lt_25_digital_guitar_combo_amplifier.pdfIn PDF document text
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_efadc359eaf44e188fe4a1c60e6f1f49.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f4b028-e8a6-455a-a369-9d988b623eb6/miller_dialarc_250_ac_dc_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db901097-bfe7-4865-ae85-0b030125e432/how_to_heal_your_life_book_by_louise_hay.pdfIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_f9723be48e0549e2a57ff945b5a56db3.pdf?index=trueIn PDF document text
    • http://fuxunowelujuxa.atwebpages.com/what_do_u_mean_by_a_quick_study.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48cbd0c7-f6b3-42ae-b72a-6a3e6352fa62/pumuxuzuzulux.pdfIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/compulsory_heterosexuality_and_lesbian_existence_buy.pdfIn PDF document text
    • https://6b9ff03a-ef48-417a-a14c-919df0f903d0.filesusr.com/ugd/f459ea_b20475ebbdae479b9f7ea88a6748db55.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A01 5160 bytes
SHA-256: b46a7a9a348841bfb1330263676671cfbeb4edc2226610762a3c17b0fc62cbf7
font_01_sfnt_off00014b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8A 12812 bytes
SHA-256: d3cc4511025c42777a893f942f52ee383e573ffcea21738f17a8b40c7b5132cb
font_02_sfnt_off00017669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17669 16120 bytes
SHA-256: 751f92ef85291b1701ea3386043310f9c552f4ef870028616695039d5d7a39ff

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