Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5503ed81ea0462…

MALICIOUS

PDF

87.8 KB Created: 2021-04-09 22:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 794c2fee04a8133608f2522a77d03fc9 SHA-1: 3e2c129f4eccc354cf5fff9d16e22baed0d723af SHA-256: 0c5503ed81ea0462d62e0b5a58e91293320a0e5344ab34f5f30482b8372db4b8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to link farms hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=beats+solo+3+wireless+gym+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463810/normal_6019ba00212e4.pdfIn PDF document text
    • https://cdn.sqhk.co/razonavari/qjehijb/95257524549.pdfIn PDF document text
    • http://damvglaz1.xyz/14218776820cbs4i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427313/normal_5fd8b3e667321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478131/normal_60512914205d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483338/normal_6008dd24c50a5.pdfIn PDF document text
    • https://cdn.sqhk.co/nabokufawogo/4hjhfhg/mindtap_answers_key.pdfIn PDF document text
    • http://dezuforupom.iblogger.org/31076948539.pdfIn PDF document text
    • http://dubiniba.iblogger.org/aplastic_anemia_guidelines_ash.pdfIn PDF document text
    • http://itwow.info/zadezuzabomasimalr95iq.pdfIn PDF document text
    • http://bofovuretokoga.22web.org/literary_criticism_example.pdfIn PDF document text
    • http://verifybadgesbusiness.com/xawibilivatuni09uvn.pdfIn PDF document text
    • http://boothattendant.com/14688415593ge515.pdfIn PDF document text
    • http://hidver.com/xukaku2bhg8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379032/normal_5fdc6bf11ce8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wetevali/2019_tamil_movies_in_kutty_rockers.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/81371962158.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/falikedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/825baac8-5cd6-4dfc-bc94-15099f4e933e/84205621100.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/what_is_the_strongest_intermolecular_force_in_t-butyl_alcohol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c2fb7bf-6367-4469-b3cc-736b837938d0/what_is_the_median_income_in_2020.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_off00010db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 3044 bytes
SHA-256: 077c9d1f363836090044d8ec301bdccd8b8f2633f8e7cad60cdae01df5771239
font_01_sfnt_off00011888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11888 5472 bytes
SHA-256: dead3bb07b6b87dd1ce2b916a408db46e7b0ca3a7d4bfc332b736bb6887e8c1a
font_02_sfnt_off00012b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2F 11176 bytes
SHA-256: b8f3b70a7432894bf5447e9cf861a8c219a4b50753f8c09dda4463699af891a8

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