Malicious PDF — malware analysis report

Static analysis result for SHA-256 c188cf80504d2674…

MALICIOUS

PDF

81.6 KB Created: 2021-05-01 23:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 01834db89321760a96eb288bdec74bdc SHA-1: a3b0c7a7ad641a3336516c3fc9ecfd0493ac206e SHA-256: c188cf80504d267463fc3ce27e7021613176debef34d86e5971d1949af14ec2a
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=how+to+get+volume+to+work+on+at%2526t+remote PDF link annotation
    • https://rubegibadamu.weebly.com/uploads/1/3/0/7/130738913/2909893.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379614/normal_5fff2dff41af1.pdfIn PDF document text
    • http://wasareni.22web.org/16002339886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501484/normal_602f502d4eff3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415065/normal_60447fe45e6dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478430/normal_602ad4b637c70.pdfIn PDF document text
    • http://demubowigipuwi.22web.org/hateful_eight_script.pdfIn PDF document text
    • https://wuselusovofose.weebly.com/uploads/1/3/1/1/131164562/43e8df.pdfIn PDF document text
    • https://loloxemevo.weebly.com/uploads/1/3/0/7/130739498/465107.pdfIn PDF document text
    • https://bexubumid.weebly.com/uploads/1/3/4/0/134040754/7704444.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/0a063ec1131318.pdfIn PDF document text
    • https://zebatezovas.weebly.com/uploads/1/3/4/6/134618099/2071060.pdfIn PDF document text
    • http://balewezekowesab.iblogger.org/zevewokunuf.pdfIn PDF document text
    • https://figidurilope.weebly.com/uploads/1/3/1/4/131452961/5411152.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/91541280-350c-4972-85ae-b6a212fccd7b/22235145320.pdfIn PDF document text
    • http://rojazudawawuse.epizy.com/gikuvoxenuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad79f0a3-7b3e-4e14-877c-4366522350e0/pugonuzebasapav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00a8c9a-ec08-420a-84bd-d16185a954c3/journey_to_the_center_of_the_earth_2_full_movie_in_tamil_download_isaimini.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_off00010098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10098 5004 bytes
SHA-256: 67a67e4e08ba9b354ea591a1a81efc7a3734cf337bd1c78cd1b77c04faf5ae09
font_01_sfnt_off0001119e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119E 12072 bytes
SHA-256: 1b392ecf14dc9cf56388527f36deaa84d6bc87862dec47feb05311ff7c1f7ae8

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