Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fed114fc2aa7c28…

MALICIOUS

PDF

67.1 KB Created: 2021-02-17 16:15:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6e6dccc499799ab3727155173b5d55b SHA-1: d86cb00dd04e72e25ab574f03c47efa02014da78 SHA-256: 9fed114fc2aa7c280d2dc448cfc094c20e17a9b8f54609888fce81f7901e4e11
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to suspicious domains, indicating a link farm or distribution point for malicious content. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The embedded URLs and the heuristic firings suggest the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://jacksth.ru/123?utm_term=troy+bilt+4+cycle+weed+eater+replacement+parts
    • http://ccckkkkk.space/globe_load_promos_15_pesosgz1h8.pdf
    • https://totaduwuvib.weebly.com/uploads/1/3/0/9/130969262/106175.pdf
    • http://dfwshootersupply.com/73373976792k6lb9.pdf
    • https://cdn.sqhk.co/bezakebijuk/iaZhcgf/majesty_northern_expansion_android_walkthrough.pdf
    • https://gopopozemilin.weebly.com/uploads/1/3/0/8/130874381/xinazujesarukore.pdf
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/5505304.pdf
    • https://lizitizesibegip.weebly.com/uploads/1/3/4/6/134685526/lazupujupapebo_pubal_koserosip.pdf
    • http://steelsho1.club/90968059321mwwkd.pdf
    • http://natorg.fun/super_mario_bros_3_pc_originalredm4.pdf
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/fiwafawirixuxo-natidedazibuno-kenuwosigo.pdf
    • https://wozizagozesa.weebly.com/uploads/1/3/4/8/134848764/e52aa53a92c3ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/potofaw/doraemon_title_song_ringtone.pdf
    • https://s3.amazonaws.com/piwanisaj/93366689308.pdf
    • https://s3.amazonaws.com/nuruvapozixix/tolidukovukozilumumizuz.pdf
    • https://s3.amazonaws.com/zodawanuror/brigandine_psx_iso.pdf
    • https://s3.amazonaws.com/dalava/alter_ego_plus_b1_guide_pdagogique.pdf
    • https://s3.amazonaws.com/zakunafu/singles_song_astitva_band.pdf
    • https://s3.amazonaws.com/poguvelefa/susukijajeze.pdf
    • https://s3.amazonaws.com/farokof/gurujuvinujuvixapureguka.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c785.bin
c708b62010beb9c1f38e5a56a4b05180a4db693f7804f963cb58736166123e7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC785 5592 bytes
font_01_sfnt_off0000da8b.bin
91d9833898e407a2137c5962719d631bad64d5bd5ed81f9f0c69d6d4557209d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8B 10788 bytes

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