Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6cd9104588a993…

MALICIOUS

PDF

95.9 KB Created: 2021-03-02 07:41:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 4d50940aa0de70942e76c9bd3bda75a2 SHA-1: 58cf5cee78e8c6f6f773f2ab48eb7fc47a3fdae2 SHA-256: 1f6cd9104588a993d3fbf60c52f83f29550d32e7907b3390d375ce20e4a34aca
126 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The PDF contains a large number of embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/wb?keyword=the%20meaning%20of%20marriage%20chapter%203%20summary PDF link annotation
    • http://slimerecipe.org/motu_patlu_car_game_2zpd95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454172/normal_5fd06ffcf0ef2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448984/normal_6023f908e4b63.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/tojobumuzeniruba.pdfIn PDF document text
    • http://devicesprotectionforusers.site/how_to_work_out_unit_price_of_a_productnpph3.pdfIn PDF document text
    • http://dokukuke.mypressonline.com/rigigakijabopuderebirojug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465018/normal_5fda7bfc0a950.pdfIn PDF document text
    • http://premial.su/wexomenusw8il.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393762/normal_5ffc495d03777.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/roxewisoxidoxuxirozilibo.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/5493522807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_5fd79a303ac24.pdfIn PDF document text
    • http://piwulag.sportsontheweb.net/can_you_learn_photography_on_your_own.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485442/normal_6003a8efda1ea.pdfIn PDF document text
    • http://sagedix.medianewsonline.com/47804177092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5fda3fba742f4.pdfIn PDF document text
    • http://forkidsshop.online/bedtime_stories_movie_main_charactersh64oo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off000128e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E9 6548 bytes
SHA-256: a16d78b4e765d5ee2bbe34147faa0d9708ca9f4bd36cf3b090d8d65c0d41a973
font_01_sfnt_off00013940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13940 5612 bytes
SHA-256: da5620ace5565f466c132196568cb74ea563200a9662134e4cb4e8e49ffffc12
font_02_sfnt_off00014c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3B 10948 bytes
SHA-256: 2cc43a8241725adf4ce54bc5ca72ce5cef28c6ec091881fede463054fd1f60e1

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