Malicious PDF — malware analysis report

Static analysis result for SHA-256 48784d42b1cf3a08…

MALICIOUS

PDF

72.0 KB Created: 2021-02-28 22:39:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2f53b450d81889767e31a4a12b88f5a5 SHA-1: c86ad6c60f867dcb83e365b01333db6fde48ca8a SHA-256: 48784d42b1cf3a08707e4065f01719f199f10a2ed58d825f11aa031a122c7325
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The embedded URLs and the PDF's structure suggest it functions as a link farm, directing users to potentially malicious or phishing websites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/123?utm_term=how+to+use+omron+walking+style+pedometer PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374852/normal_5fd041f8b3f9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469634/normal_602807cc5ca55.pdfIn PDF document text
    • http://alifan.store/15256397835of0mm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462345/normal_600ced9872e14.pdfIn PDF document text
    • http://bitejes.iblogger.org/reading_passages_for_toefl_ibt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465025/normal_5fdedcf06a4ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469386/normal_602ea2ea49388.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454180/normal_5fdb73ba7e927.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/gudozoxedofipilekanasezakw131a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_601ae117c7e5b.pdfIn PDF document text
    • http://gazzsheff.xyz/are_the_blocked_numbers_on_iphone_in_orderv4qk1.pdfIn PDF document text
    • http://itawegan.space/cfa_level_1_20184minc.pdfIn PDF document text
    • http://xadixul.66ghz.com/antiacidos_farmacologia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wexewowi.rf.gd/40297267254.pdfIn PDF document text
    • http://tedusola.epizy.com/lulokurariruwedadadinituf.pdfIn PDF document text
    • http://kemubozureta.epizy.com/bepusemozufujuxorof.pdfIn PDF document text
    • http://rozipiliwune.epizy.com/lcm_worksheets_7th_grade.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_off0000db43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB43 5496 bytes
SHA-256: a772b6d1891f78bf72290e1ba4b7dfbcdeed20b8ce81e9cd7e2718e19ee43816
font_01_sfnt_off0000edee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEE 10332 bytes
SHA-256: 1954f6acffea0b9d2358cc0935554783ff936e6b361f082bf57fb7a6f729db79

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