Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ccdad87090e6fe…

MALICIOUS

PDF

79.0 KB Created: 2021-03-26 07:26:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c35bf2bae32c94b4bca5acc39622d736 SHA-1: 66b598fb84a00d6ed189212a2f0508f77f40ea50 SHA-256: 83ccdad87090e6fee5e99907581c626bffa32f984e58c703d00a55197cf9b9bb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a 'kicker l7 manual', indicating a lure to disguise the malicious intent. The presence of multiple external URIs and the link farm heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/wix?keyword=kicker+l7+manual PDF link annotation
    • https://cdn.sqhk.co/munakuvu/ehjjhid/40994165280.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375887/normal_6036871f17c2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446924/normal_5fe41fd458daa.pdfIn PDF document text
    • http://milansit.space/how_does_a_retractable_screen_storm_door_work1mf9j.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/diiOy70/66279857735.pdfIn PDF document text
    • http://regsen.website/dark_sword_dst1rdgb.pdfIn PDF document text
    • http://profapp.pro/social_studies_map_worksheets_2nd_gradeuo6v2.pdfIn PDF document text
    • http://xokodiraki.22web.org/wavixin.pdfIn PDF document text
    • https://cdn.sqhk.co/wikepijosipi/hVayWHN/94583032007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393635/normal_604218a528c2b.pdfIn PDF document text
    • http://barbanapoli.moscow/29837678899uy4ky.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459466/normal_6014d541211f1.pdfIn PDF document text
    • http://shopyou.online/vitamix_smoothie_recipes_reddit3liih.pdfIn PDF document text
    • https://cdn.sqhk.co/zedozomi/Uihcgh9/classic_hits_radio_stations_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/nizufalagef/f5IhhLr/female_furry_doll_maker_dress_up_games.pdfIn PDF document text
    • http://babblescoop.store/mekajixabowisi4j4k8.pdfIn PDF document text
    • http://morpeoplelife.ru/how_to_grow_wings_on_your_backc5h93.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sisaxu/wosiniv.pdfIn PDF document text
    • http://bubanav.epizy.com/ranenuwazuzu.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/fevulinubazakoradiram.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/57126373157.pdfIn PDF document text
    • http://bofiragomux.rf.gd/gameshark_pixelmon_6._3._4.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/dk_eyewitness_travel_guide_japan.pdfIn PDF document text
    • http://zokitidekav.epizy.com/59177139335.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C5 4572 bytes
SHA-256: 32171eae721deeb7d08592ce030518f967ef8208403d0817f523cf91cc3c28be
font_01_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 11248 bytes
SHA-256: bf493d043a3287341984fd17bf317adfdb09dc548f60d8b30f54568f702b6972
font_02_sfnt_off00011ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF2 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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