Malicious PDF — malware analysis report

Static analysis result for SHA-256 5abec34fcec8b5ca…

MALICIOUS

PDF

81.0 KB Created: 2021-05-13 20:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: bce1280878dc8a0c228dfa6d9edc01fe SHA-1: ae36a9fe118d89c3298fc54238651ed208befa40 SHA-256: 5abec34fcec8b5cafa3c955ea51c111a8785d9025e3d9bbec5c81bfb388c0b88
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating a link farm designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and the heuristic firings point towards a spearphishing attachment as the initial attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://botokaw.ru/strik?utm_term=bob+revolution+flex+3.0+duallie+2020 PDF link annotation
    • https://cdn.sqhk.co/madosodu/KicFdgf/34217712782.pdfIn PDF document text
    • https://linazoforup.weebly.com/uploads/1/3/0/8/130814758/145254.pdfIn PDF document text
    • https://tovijivesigaz.weebly.com/uploads/1/3/5/3/135327805/xirajufasapuso.pdfIn PDF document text
    • http://juvovagesubo.mywebcommunity.org/49860969447.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/40k_space_marine_codex_8th.pdfIn PDF document text
    • https://wakevilapiz.weebly.com/uploads/1/3/4/9/134903367/fuwopasukezu-kosojedasemodi-lipazuzodajek-wurasaxinubuzed.pdfIn PDF document text
    • http://rivilidopu.medianewsonline.com/nexiroda.pdfIn PDF document text
    • https://cdn.sqhk.co/jagojixego/Ahghahd/crazy_freekick_stage_16.pdfIn PDF document text
    • https://rulesamafov.weebly.com/uploads/1/3/4/7/134768786/d7052d7.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/ranco_fridge_thermostat_adjustment.pdfIn PDF document text
    • https://zikemuwebiwolim.weebly.com/uploads/1/3/5/9/135992964/vejana-wijaloxafiz-naxemotuxito.pdfIn PDF document text
    • https://xorexataziz.weebly.com/uploads/1/3/4/4/134496469/1343276.pdfIn PDF document text
    • https://bitojobuf.weebly.com/uploads/1/3/4/8/134892495/tobida.pdfIn PDF document text
    • https://betataniboluwi.weebly.com/uploads/1/3/0/9/130969090/9132321.pdfIn PDF document text
    • https://gobebirerelimi.weebly.com/uploads/1/3/4/6/134651667/somuzinevuranenop.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/best_1_43_diecast_cars.pdfIn PDF document text
    • https://wedarudojov.weebly.com/uploads/1/3/4/0/134012757/pavewel.pdfIn PDF document text
    • https://mukaperu.weebly.com/uploads/1/3/4/6/134649449/bajanolawaxelipawo.pdfIn PDF document text
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/pesulatab-pipik-degigivifiliv-pikekujij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rodedewezijore.atwebpages.com/60978779938.pdfIn PDF document text
    • http://vamavaremimot.atwebpages.com/el_neoliberalismo_en_bolivia.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_off0000f027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 5512 bytes
SHA-256: 48536505a260cfb58ec51df4025441a28d702e3aed449f3792f4dadcf572aa3d
font_01_sfnt_off000102fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FC 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00010b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8A 11940 bytes
SHA-256: 741fdac697280314c8e5429a516a29e6c439729b617b239239a0a74b9c47c005