Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbeca740ad95e365…

MALICIOUS

PDF

77.3 KB Created: 2021-03-04 17:40:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0caf84d9dcff3b46f65863d9823b945 SHA-1: e1639dbaad08143cb9fb933a8c333a2aa5dff2e3 SHA-256: fbeca740ad95e365d7cf04496f89d4abf64eba2d56c825ef9a5656a6470e7a14
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common technique for SEO poisoning or directing users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=garage+sale+mystery+movies+cancelled
    • https://cdn.sqhk.co/gerukoso/dEgcga0/natawisejenod.pdf
    • https://cdn.sqhk.co/bepemuno/dLfrrjh/cruise_critic_carnival_breeze_forum.pdf
    • https://cdn.sqhk.co/zijigemeworu/jtiasCI/vuravesijusifabiwaxazedo.pdf
    • https://cdn.sqhk.co/fazejitev/8WRif0Z/ditibikajigabo.pdf
    • https://cdn.sqhk.co/nejibija/fEP0Hie/meridian_157_chapter_2_mod_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4415077/normal_6009ac8d18673.pdf
    • https://cdn.sqhk.co/tefozakozup/LhhEjhi/police_officer_salary_ny_state.pdf
    • https://cdn.sqhk.co/nokulebepoba/AgdQbet/tatofagosoparowozododit.pdf
    • https://cdn.sqhk.co/vebiziwob/ujdjdMH/36298381655.pdf
    • https://cdn.sqhk.co/mukujoripu/xMgiygd/blocky_roads_apk_full.pdf
    • https://cdn-cms.f-static.net/uploads/4380531/normal_60270484af477.pdf
    • https://cdn.sqhk.co/vumuwilaj/hiiBPje/mcpe_lucky_block_race_map_no_mods.pdf
    • https://cdn-cms.f-static.net/uploads/4385198/normal_6027e59b3a219.pdf
    • https://cdn.sqhk.co/dukizukijire/iaEieii/3526584802.pdf
    • https://cdn.sqhk.co/fokodusi/dMbDErP/volkswagen_golf_gti_0-_100_km_h.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_b0216a2b887b483991d62af4118dde44.pdf?index=true
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_8e0c5d72bf5d406ca3da4b975f6518f1.pdf?index=true
    • https://s3.amazonaws.com/xupovobejanam/napa_valley_covid_rules.pdf
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_f088b9073e954995b34b08f38a8642ea.pdf?index=true
    • https://s3.amazonaws.com/fusopoxipo/echo_weed_eater_parts_srm_2100.pdf
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_e6e4201763c44df088c624006c690855.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c0.bin
12aad18327cdb56d3b918961c761986b45f9b97f9dfa8acaa117e61573eb27a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C0 5452 bytes
font_01_sfnt_off00010445.bin
bdee79bd585a03d113cfc2835c28d091557f976c917b87a56f5a81fe0b96b80d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10445 10420 bytes

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