Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9e63dfd89b80da…

MALICIOUS

PDF

114.6 KB Created: 2021-05-16 20:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d4e643a56b1ec6a88559532c0ef3a7cd SHA-1: 54f826ea5cc54254859f26741a83c15c22f3b637 SHA-256: 7b9e63dfd89b80da7034d98e653a12cc4228ab129b0cd3bb49f2ed626a4869d1
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable domains and are likely part of a link farm designed to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=final+fantasy+x+playstation+2+walkthrough PDF link annotation
    • http://tajavupirewu.22web.org/entrepreneurship_development_and_business_communication_agrimoon.pdfIn PDF document text
    • https://raxopukefafifi.weebly.com/uploads/1/3/2/6/132695755/zanet-kedijak-vasugukem-vipefonujeni.pdfIn PDF document text
    • http://kudukudimox.sportsontheweb.net/wulanumujilasaluzonujak.pdfIn PDF document text
    • https://ludolukek.weebly.com/uploads/1/3/4/6/134699908/maremij.pdfIn PDF document text
    • https://kumupesefutevun.weebly.com/uploads/1/3/4/4/134463509/korevubemija.pdfIn PDF document text
    • https://bujajegufo.weebly.com/uploads/1/3/4/1/134108800/8169167.pdfIn PDF document text
    • http://mawidoxejonej.iblogger.org/rolling_stone_top_500_songs_of_all_time.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/6102857.pdfIn PDF document text
    • http://kedejusofapirej.22web.org/wotanew.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://uploads.strikinglycdn.com/files/b993a2d7-d140-4b87-be28-afd4e9be5b2b/frigidaire_70_pint_dehumidifier_fad704dwd_amazon.pdfIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_c0e3abb9c7fe4147bee03ee7f83cd60b.pdf?index=trueIn PDF document text
    • http://pejabefi.rf.gd/laxawowir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/495cf29c-2f8c-4613-85e3-5e41cf3ea9bd/what_is_human_resources.pdfIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_8aa00eb24c624b26b45d63a6c921432f.pdf?index=trueIn PDF document text
    • http://vivimaga.epizy.com/72551282281.pdfIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_19bf6c5ef36b47d69c29b72845d8f146.pdf?index=trueIn PDF document text
    • http://toloruware.rf.gd/drug_metabolising_enzymes.pdfIn PDF document text
    • http://tudemofexurujen.epizy.com/how_to_cancel_driving_licence_appointment.pdfIn PDF document text
    • http://wobozema.epizy.com/napuripuv.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15422 9272 bytes
SHA-256: d36c01e8289dae2e1a8269b67a56f836118f356be7333e4b757d75485e6560f8
font_01_sfnt_off00017347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17347 5340 bytes
SHA-256: 4a5d7dfccb82d7b0b52e7028a8e09eb91c5bd6233805f4a9788a774ea80922b3
font_02_sfnt_off00018585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18585 12216 bytes
SHA-256: 51e5d6627c2a857e522a8544aef926a7377ef47e420b69465631b17d7711d090
font_03_sfnt_off0001ae48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE48 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3