Malicious PDF — malware analysis report

Static analysis result for SHA-256 117b2f16435f6970…

MALICIOUS

PDF

74.2 KB Created: 2021-02-02 07:55:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1f73883ccb1d7e51ccec539b3b00272c SHA-1: 7b0a691279969d23b048ab861f2f85a62e322a03 SHA-256: 117b2f16435f69702cf11bab019827b715383c97d5021ba126d837f505745dd3
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document body, though truncated, contains references to 'Java jre 64 bit win 10', suggesting a lure for software downloads. Numerous external URIs were extracted, many pointing to disposable hosting, indicating a phishing or malware distribution attempt. The presence of embedded JavaScript, though not detailed, further supports malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=java+jre++64+bit+win+10 PDF link annotation
    • http://serikanipesemo.iblogger.org/visas.pdfIn PDF document text
    • https://cdn.sqhk.co/felinavaw/ut7gcr1/fufaxa.pdfIn PDF document text
    • http://raifaisentapp.online/38236328603hekbr.pdfIn PDF document text
    • http://shlifovka-pol.website/329014647050cmp1.pdfIn PDF document text
    • https://cdn.sqhk.co/datimemovuko/xfZiUid/stickman_sniper_2_mod_apk.pdfIn PDF document text
    • http://kopawaruda.22web.org/oxymoron_and_paradox_answers.pdfIn PDF document text
    • http://webmastervlad.ru/all_the_bright_placesnwk1l.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/Xsjgied/82538464164.pdfIn PDF document text
    • https://cdn.sqhk.co/bexamajuw/mzQidHO/liar_s_dice_board_game.pdfIn PDF document text
    • http://umkatrade.ru/pazasumifutadaleperaluh6js.pdfIn PDF document text
    • http://fisuruwibowin.66ghz.com/korebiwelimofalinogi.pdfIn PDF document text
    • https://cdn.sqhk.co/devepogisog/699IO3L/glorious_eleven_football_manager_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/lafugafeniki/sHjagj7/4_pics_1_word_plus_level_13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/feseni/lirapibavoxadabawavasiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/gefabimusanoxim.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/bunker_hill_security_dvr_manual.pdfIn PDF document text
    • http://suvowafavij.epizy.com/30768834775.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/antakshari_songs_free.pdfIn PDF document text
    • http://negubikalijewu.epizy.com/as_time_goes_by_piano_sheet.pdfIn PDF document text
    • http://lunagugodojeb.epizy.com/tidusozi.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_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 5264 bytes
SHA-256: bfff5a2a3c210a60b8dbdb7e216ec8bd3d01d1435f08aa28f6a589506dc0fea7
font_01_sfnt_off0000f810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF810 10380 bytes
SHA-256: 10810900de3ce0e9710918c19883014dbc3460d478dd75512f203383b46a6642

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