Malicious PDF — malware analysis report

Static analysis result for SHA-256 86519ac3d643c516…

MALICIOUS

PDF

73.5 KB Created: 2021-04-13 13:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2393d2ba0f20d4f96e94f3c877ce58c4 SHA-1: 24e29703b158de1cfcfe29f1cc3690654d47ea63 SHA-256: 86519ac3d643c516ae654a73b09d4eb9d44333ca9a7fb51d054f21adb52d793b
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' and another flagging a 'PDF_URI' pointing to a suspicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites, potentially disguised as search results or resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://seumenha.ru/strik?utm_term=cisco+dpc3825+username+and+password
    • http://hamlikjorettoop.ru/delonghi_air_conditioner_pac_n130hpe1tjqu.pdf
    • http://sungo1.space/mutivibusakos95afi.pdf
    • http://meetdouche.xyz/ver_persepolis_online_espaol_latinomvjhv.pdf
    • http://icub.tech/seismic_load_calculation_as_per_asce_7-16cjsha.pdf
    • http://life50it.pro/robert_monroe_hemi_sync_meditationve2sz.pdf
    • http://paksorond.xyz/wotikivq9q0k.pdf
    • http://fartook.online/fosuv04qyl.pdf
    • http://axecheat7.xyz/pirelujubipaxubz2su4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d7504aae-3d37-493f-8789-a5629a6fcc30.filesusr.com/ugd/7ca9f5_a26636ca12644dc3aca73b576e1752b0.pdf?index=true
    • https://3cde87c3-25ab-478b-b58d-ba072f1c7540.filesusr.com/ugd/255d97_e5d9c6712a424fd786b329d47798ad64.pdf?index=true
    • https://s3.amazonaws.com/vibasujefir/aircare_hdc12_replacement_wicking_humidifier_filter.pdf
    • https://s3.amazonaws.com/desenaz/trastornos_alimenticios_en_adolescentes.pdf
    • https://s3.amazonaws.com/bulolimepol/34001193125.pdf
    • https://s3.amazonaws.com/bidurudilidujug/juwoxa.pdf
    • https://uploads.strikinglycdn.com/files/171bfe9a-de92-4b07-880b-3e576fb1e7cf/wiwotalipipadokir.pdf
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_94674970faf041b89f4589cb88cf68c0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e807a897-7e5b-417a-91d6-f4d9e9f49f61/simofef.pdf
    • 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_off0000e0e6.bin
09dd5866e4ba75e2d93b73c7f39bc3c61756fd82534b3a921f613abd87838d77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E6 5796 bytes
font_01_sfnt_off0000f49b.bin
36d8396dad091a436c4c63585d8eafc851bdb958e54eabbc6eb93b9c7c27e3bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 10728 bytes

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