Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c63f8981ccd2ea…

MALICIOUS

PDF

74.5 KB Created: 2021-02-16 20:56:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e9b73c7f04081734d14e0045147b805 SHA-1: 819fbbb60cbe508fdeed3b1fa55cbac62a196a85 SHA-256: a1c63f8981ccd2eabd3d997b89f8f177fdce4d3ee04bedce077cf8a02c58b7e3
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, suggesting a link farm designed to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body text, though truncated and malformed, includes terms related to books and downloads, aligning with the link farm's deceptive purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://crophysi.ru/strik?utm_term=best+english+learning+books+pdf
    • https://vexepagofebove.weebly.com/uploads/1/3/4/8/134866030/9dd73f6bc21f5c.pdf
    • https://cdn.sqhk.co/gabazumad/ezgh4sh/pixel_car_racer_5._7_tune_gtr.pdf
    • http://lasleymarkt.ru/iphone_sms_ringtone_remix_downloadir7ap.pdf
    • https://kevavabine.weebly.com/uploads/1/3/1/4/131406582/vekoda.pdf
    • https://vixixufabajuwe.weebly.com/uploads/1/3/1/1/131163632/rijigixedir_xutigomiba_wobuzim.pdf
    • http://artrosil.xyz/repaso_del_capitulo_crucigrama_answers_1a-_8sgwcv.pdf
    • https://wirevoge.weebly.com/uploads/1/3/1/8/131856771/sowato_nixefubopizat_dozetoz_ruwit.pdf
    • https://kumajevebak.weebly.com/uploads/1/3/1/8/131856027/soxinegaxamode.pdf
    • https://cdn.sqhk.co/xubipoxeguza/Iha0DhV/top_5_attitude_ringtones_2019_free_download.pdf
    • https://cdn.sqhk.co/lakekomum/gdBKgfD/hashtags_to_increase_followers_and_likes_on_instagram.pdf
    • https://xudemogarutigi.weebly.com/uploads/1/3/4/7/134733212/5204204.pdf
    • https://dofonumid.weebly.com/uploads/1/3/5/3/135314870/panewewuribex-jidupixejov-xuzefodamadot.pdf
    • https://laropavo.weebly.com/uploads/1/3/4/5/134585926/2596233.pdf
    • https://jaweditulopo.weebly.com/uploads/1/3/4/3/134313576/jebag-wokalidoj.pdf
    • https://zelelifejoba.weebly.com/uploads/1/3/4/3/134321633/jokevuzomem.pdf
    • http://golomashvanna.xyz/74236598037ibt0v.pdf
    • http://fullpisetc.ru/897502484670u9wc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xulitapaxi.rf.gd/adobe_acrobat_application_manager.pdf
    • http://sitidex.epizy.com/factoring_trinomials_game_worksheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d970.bin
c1803d7f236fcdc022cb77c44e582b121f5b51a65c4d2bab653924221f14ae1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD970 5556 bytes
font_01_sfnt_off0000ec44.bin
b54762f19ef417d85f82b9a590db32093c34483c2d7cddfb5cf74a58f197e439		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 3484 bytes
font_02_sfnt_off0000f995.bin
68280351f00472684772285ff19b476badf2ff00fe8dfadaf612631aa72d56b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 10016 bytes

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