Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4cd4e725cd19d5…

MALICIOUS

PDF

71.4 KB Created: 2021-02-24 06:23:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8fcfe948c6f5d76e5f134301d4531163 SHA-1: 4af0aaf637d64f818c60ab84e267fabcd9eb6c98 SHA-256: 1a4cd4e725cd19d54d643f322a6f5ca3f4b9e1bc00057abadcc1ef9d2d94dbc4
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/123?utm_term=kinige+telugu+books+free+download PDF link annotation
    • https://cdn.sqhk.co/jijipidub/ikkWgfE/fokiso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475582/normal_5ff1bcafa1a98.pdfIn PDF document text
    • http://xupoluwifokolo.22web.org/life_fitness_t3_treadmill_stuck_key_error.pdfIn PDF document text
    • http://jsexj.fun/95414115179asg10.pdfIn PDF document text
    • http://kpupnov.pro/what_does_the_bible_say_about_444kbauo.pdfIn PDF document text
    • https://cdn.sqhk.co/nixafusoda/jcFyA0c/globe_load_internet_promo_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/ULzQATu/gorupi.pdfIn PDF document text
    • https://cdn.sqhk.co/natokaze/chDtwjc/71499894294.pdfIn PDF document text
    • http://madewithsunshine.com/laser_and_feelingsr2n8a.pdfIn PDF document text
    • http://legendnat.space/hp_4630_ink_cartridge1h3xs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462056/normal_5fcd2c83e1f18.pdfIn PDF document text
    • http://dreabling.online/game_chin_tranh_vit_nam17hqy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387410/normal_5ffc85098d431.pdfIn PDF document text
    • http://cparta.moscow/odia_film_abhimanyu_full_movieumwr0.pdfIn PDF document text
    • http://the-english-temple.com/fatovituvizekufakufp9qvn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gigitepusiligo.epizy.com/87084136886.pdfIn PDF document text
    • http://joxumokuri.epizy.com/ausfhrlicher_lebenslauf_beispiel.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/20460523578.pdfIn PDF document text
    • http://nizamazibenu.rf.gd/shazam_apk_para_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/apple_inc_stock_information.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/19850021637.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34D 5340 bytes
SHA-256: 341fd4d0dad98d01eb9b27faf6974a10a46da0e9fb6f2982808f53b525d600e7
font_01_sfnt_off0000d59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59C 10940 bytes
SHA-256: b008d35fb4a68091d002f9bab55b58eb9b94b60f6b52d1b580224ab8a02a9710
font_02_sfnt_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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