Malicious PDF — malware analysis report

Static analysis result for SHA-256 697167598d4b91f4…

MALICIOUS

PDF

83.2 KB Created: 2021-02-26 21:47:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 650cef9f0963fa89a36dba6544a7e9f6 SHA-1: e00bc128e8a740f205c39361f90795db5d790678 SHA-256: 697167598d4b91f49cacc2c2c3fb5599c6b6f78c58b06fabd908f60a2950969d
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, including one that appears to be a lure for downloading programming interview materials, suggesting a social engineering tactic. The presence of multiple disposable hosting links further supports a malicious intent to distribute harmful content.

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://nipisod.ru/123?utm_term=elements+of+programming+interviews+c%252B%252B+pdf+download PDF link annotation
    • http://wewogokuwidu.mywebcommunity.org/how_to_activate_gta_4_manually.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/givaxad.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/matonagib.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/how_hard_is_it_to_set_up_a_wordpress_website.pdfIn PDF document text
    • http://macsk.space/75697551351fh2s5.pdfIn PDF document text
    • https://roguzemu.weebly.com/uploads/1/3/6/0/136018034/puduretose-nabofak-liwalunu.pdfIn PDF document text
    • http://rarurude.22web.org/vanaresitedenef.pdfIn PDF document text
    • https://balebapu.weebly.com/uploads/1/3/5/3/135322653/6903933.pdfIn PDF document text
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/ffe711cae825e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://foripoj.epizy.com/xivavuvalatomebu.pdfIn PDF document text
    • http://zenejifawulo.epizy.com/24_hour_weekly_schedule_template.pdfIn PDF document text
    • http://mutodilevo.epizy.com/41010067974.pdfIn PDF document text
    • http://gimukukuzape.epizy.com/valanojojagewojemapo.pdfIn PDF document text
    • http://renedutej.rf.gd/46986497614.pdfIn PDF document text
    • http://nofadokar.rf.gd/gepejujijodo.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/video_er_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/brooklinen_vs_snowe_sheets.pdfIn PDF document text
    • http://xakafof.rf.gd/how_to_study_korean_workbook_free.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_off0001060b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060B 5584 bytes
SHA-256: b30212b113322c4dfb87031bb29a0976b72fe4761406cce2d82858e31859a439
font_01_sfnt_off0001190b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190B 11344 bytes
SHA-256: b5f16526185473c99e9521cb4816588a2d229c3ddca21e1786d10b3b2c5c6d16

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