Malicious PDF — malware analysis report

Static analysis result for SHA-256 b450e3555c5bdae3…

MALICIOUS

PDF

74.7 KB Created: 2021-05-03 00:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: aeb9b9f833a15bda65dc91fbf4e4cb10 SHA-1: e88a438c49f541adf87b44487b16075cb7a7c015 SHA-256: b450e3555c5bdae387c4d9dc5125eade3e29c8d2dab6faa07e425dd35f30a3da
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to link farms hosted on disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=sears+kenmore+sewing+machine+158.850 PDF link annotation
    • http://zexawof.22web.org/arlon_slx.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/dxgfswP/74482471608.pdfIn PDF document text
    • http://pusewuvi.medianewsonline.com/dell_xps_8300_power_supply_upgrade.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/chdSggl/jiffy_lube_oil_change_coupons_15_off.pdfIn PDF document text
    • https://cdn.sqhk.co/vilubofi/yzIidib/how_to_do_blockly_games_maze_level_9.pdfIn PDF document text
    • http://rezumitisud.mygamesonline.org/2383314927.pdfIn PDF document text
    • https://cdn.sqhk.co/matajikiwov/dGhaMeX/fozanagugoko.pdfIn PDF document text
    • https://cdn.sqhk.co/pagifizipafo/hhQijLK/giferapinirugupolovipubu.pdfIn PDF document text
    • https://cdn.sqhk.co/kevamubeminu/iyKghhj/nba_player_black_lives_matter.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/rutowigut.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/igfdvu1/97722001994.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zilinovupiketom.epizy.com/sadof.pdfIn PDF document text
    • http://jumebesatupa.epizy.com/minecraft_technic_launcher_chip.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/99141867152.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/5451250837.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/sokarus.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/merge_mac_automator.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/fapupebifowiveje.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/brooklyn_nine_nine_tv_series_free.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_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 5984 bytes
SHA-256: 690a959200e5868873b56691a8dd086bc0fa2ada82a0f538117ea69b9d4b1bd6
font_01_sfnt_off0000f838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF838 10984 bytes
SHA-256: 9005bfb7422732b93a9bef2fb57cddf5ea2c330c5768c96f8e959e4fcd57602c

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