Malicious PDF — malware analysis report

Static analysis result for SHA-256 0957c8e9860a2611…

MALICIOUS

PDF

68.6 KB Created: 2021-02-04 13:57:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: dd09cd83781462e2e53b35e15f0adc44 SHA-1: 1925c3b4667b8af383de7c142482a8b7715a4dbe SHA-256: 0957c8e9860a26117dcc0b3240052a566aea03770b2054e2fdc3dbd6411d07e2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

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://leonvi.ru/123?utm_term=cupcake+decorating+supplies+nz PDF link annotation
    • http://shtangye.xyz/weather_atlanta_november_2018ok0yl.pdfIn PDF document text
    • http://podumurenuzus.22web.org/alexander_pope_iliad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387417/normal_600fabdf9dc30.pdfIn PDF document text
    • http://fitokapss.xyz/34028908717yjept.pdfIn PDF document text
    • https://widufosonetorif.weebly.com/uploads/1/3/4/5/134598319/5960789.pdfIn PDF document text
    • https://govobozof.weebly.com/uploads/1/3/5/3/135315692/02d64bdfd30b.pdfIn PDF document text
    • http://gefejisu.22web.org/dinesh_chemistry_class_9_free.pdfIn PDF document text
    • http://medicinfo.online/lowefomafafezikwfj4r.pdfIn PDF document text
    • http://potoborotagivud.22web.org/lutasazojokupinumu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444357/normal_6007d30116218.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385012/normal_5fc6e023eed09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387573/normal_5ffe096e44316.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tukudapig.epizy.com/equivalent_fractions_to_percents_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/zamosarerugune.pdfIn PDF document text
    • http://gojemivul.epizy.com/rimesudasexideledom.pdfIn PDF document text
    • http://jowawotivedalox.rf.gd/20441753519.pdfIn PDF document text
    • http://zobovobewuw.epizy.com/bolero_full_hd_movie.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_off0000c0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A0 5260 bytes
SHA-256: 149477a4d5feaa3f50f71c4fc14688b878c9e2f13c0cb4665fc42841945ec0c3
font_01_sfnt_off0000d296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD296 10652 bytes
SHA-256: 7399a156689b07ded04beb0fb90599844db5010efce77963fc9807790d585ab3
font_02_sfnt_off0000f720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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