Malicious PDF — malware analysis report

Static analysis result for SHA-256 083752e3d8162f6b…

MALICIOUS

PDF

73.3 KB Created: 2021-02-08 09:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b0896a7257ce89cf398e172e602b898d SHA-1: 7b88992ab40c89c7d425b709459b065cfe6d7b13 SHA-256: 083752e3d8162f6b7e32cc83beae9490b76b628be71af7628a66480581a2f7b5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO manipulation tactic. The presence of a URL related to 'whatsapp messenger for android free apk' suggests a lure to download potentially unwanted or malicious software. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wb?keyword=whatsapp%20messenger%20for%20android%20free%20%20apk PDF link annotation
    • http://vatologox.iblogger.org/calma_pedro_video_song.pdfIn PDF document text
    • https://cdn.sqhk.co/joziroluxu/rgetQUA/latest_nigerian_gospel_songs_june_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462065/normal_601fe2221b217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459341/normal_6019c6880ea41.pdfIn PDF document text
    • http://zuluwana.iblogger.org/parkitect_decoration_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393785/normal_600766b1b885f.pdfIn PDF document text
    • https://xujopikaxatanow.weebly.com/uploads/1/3/4/8/134850499/40e447533.pdfIn PDF document text
    • https://cdn.sqhk.co/duxajoje/MPoic6f/cute_acrylic_nails_for_10_year_olds.pdfIn PDF document text
    • https://cdn.sqhk.co/vagizabibo/gghgjey/28243008207.pdfIn PDF document text
    • https://cdn.sqhk.co/divekezor/pigeYDO/banana_runtz_thc.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/hU8he9q/play_sudoku_medium_level.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403421/normal_5ff66caa34e9a.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvukidovime/jiGMidK/electronic_component_symbols.pdfIn PDF document text
    • https://popofexepazor.weebly.com/uploads/1/3/2/6/132680818/e9b6741d91214.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454681/normal_5ff22780e9e01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388612/normal_5ff2caa03144a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403408/normal_5fca96b765e9a.pdfIn PDF document text
    • https://cdn.sqhk.co/gijesali/zzvjfhe/top_10_music_charts_us.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vizeroxati.rf.gd/76004341255.pdfIn PDF document text
    • http://pazoluno.epizy.com/biblical_theology_vs_systematic_theology.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_off0000df97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF97 5500 bytes
SHA-256: eae877655f51a265b09abd93b604b447c6e947fbb6af9fdfbca46553fb03ba56
font_01_sfnt_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 10836 bytes
SHA-256: 74a37bcac5eeae61cab560c254b9354185adad1eb25dd30dd9bc2c20cba35881