Malicious PDF — malware analysis report

Static analysis result for SHA-256 359f835444a2d0c1…

MALICIOUS

PDF

90.6 KB Created: 2021-03-22 09:48:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ec3beb68dc1d4291ed0419bd82112fe6 SHA-1: 3b081be2d2f16817c74f7bbe46015cabdba467b8 SHA-256: 359f835444a2d0c1f42e72903441fa6b81dfffd6b58c9ab9de8c6a31635a9685
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable hosting. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jumiwimov.ru/strik?utm_term=what+is+a+camera+lucida PDF link annotation
    • https://lozugukavokukes.weebly.com/uploads/1/3/4/3/134357100/boririgekanatedur.pdfIn PDF document text
    • http://fakexexu.sportsontheweb.net/carbanion_reactions.pdfIn PDF document text
    • https://buxexemap.weebly.com/uploads/1/3/4/8/134890763/motokubusali.pdfIn PDF document text
    • http://websporizlehd.com/42058779686mtnr3.pdfIn PDF document text
    • http://thepropheticapp.com/launch_trampoline_park_watertown_hourslu28r.pdfIn PDF document text
    • http://juponuziwotaga.mywebcommunity.org/webasosudotoxemesulafe.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/how_to_pair_airtel_dth_remote_with_panasonic_tv_remote.pdfIn PDF document text
    • http://dobofozepop.mygamesonline.org/is_death_note_a_netflix_original.pdfIn PDF document text
    • https://lulaxifijugom.weebly.com/uploads/1/3/0/7/130776747/1de14bc5f.pdfIn PDF document text
    • https://jidupedepinamup.weebly.com/uploads/1/3/2/6/132680921/4269b4.pdfIn PDF document text
    • https://tupisefam.weebly.com/uploads/1/3/1/3/131383837/dupukej.pdfIn PDF document text
    • https://zasawebisev.weebly.com/uploads/1/3/4/8/134865024/pusepab.pdfIn PDF document text
    • https://fenipedixov.weebly.com/uploads/1/3/5/3/135385823/1720079.pdfIn PDF document text
    • http://pochta-24.cc/wuzisubatawogatyvg8d.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/estadistica_para_administracion_anderson.pdfIn PDF document text
    • https://tejalegevususo.weebly.com/uploads/1/3/1/6/131637178/1e466413.pdfIn PDF document text
    • http://pukujadud.getenjoyment.net/84965268438.pdfIn PDF document text
    • https://ligapixoxos.weebly.com/uploads/1/3/4/3/134378271/dekot-wowejoririxeb-zufulezevegena.pdfIn PDF document text
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/gosazu-xegub.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
    • http://sefokirof.onlinewebshop.net/kivigupixazep.pdfIn PDF document text
    • http://nununad.myartsonline.com/vulisine.pdfIn PDF document text
    • http://gafodix.myartsonline.com/36428331410.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_off00011790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11790 4856 bytes
SHA-256: ba24483a13fe7fceb402f1def957f11f12ff331b52bf9858f7a269fa54986fb3
font_01_sfnt_off0001280e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280E 11408 bytes
SHA-256: 62ee16a4576a65e4fbfa38f1f0f696046fe04eb52df62ffb43805e7609830302
font_02_sfnt_off00014f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F20 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361