Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b703c870b05fd4…

MALICIOUS

PDF

86.7 KB Created: 2021-05-03 03:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fdea36553c8cb34422406da98760f32b SHA-1: 274b78dd323ac5bba2aa426bed624fe27fc7f2dd SHA-256: a3b703c870b05fd4813de7567bc1e20806091da6d2c63c3c21be622bbb6611fb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm suggests it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=too+busy+not+to+pray+free+pdf PDF link annotation
    • http://tublitalia.fun/lefuvopapugokexojibus6w85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455208/normal_5fe3c8b718608.pdfIn PDF document text
    • https://jojapewabivato.weebly.com/uploads/1/3/1/3/131379205/00ffaeef181.pdfIn PDF document text
    • https://bujovuve.weebly.com/uploads/1/3/0/7/130738596/lidafafetorikepun.pdfIn PDF document text
    • http://badge-verification-center.com/stone_soup_magazine_coupon_codemqzk9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470542/normal_5fd8b5fa32cf0.pdfIn PDF document text
    • http://hairhome.moscow/singer_model_4562_bobbin_typexfxl4.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/gfyhegh/world_soccer_league_table_standings.pdfIn PDF document text
    • http://xtrading.buzz/how_to_teach_singular_and_plural_to_kindergarten6cuga.pdfIn PDF document text
    • https://cdn.sqhk.co/dedomafub/jaggiea/zugokudamubomatewifira.pdfIn PDF document text
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/cca24942e18dbcc.pdfIn PDF document text
    • https://kumoguvam.weebly.com/uploads/1/3/5/3/135382809/gomuregif_tunonavobimu_fifimurepan.pdfIn PDF document text
    • https://gadebalemalun.weebly.com/uploads/1/3/4/4/134443756/7652f104.pdfIn PDF document text
    • https://cdn.sqhk.co/lakivasulis/haF4ggl/death_moto_3_fighting_bike_rider_hack_download.pdfIn PDF document text
    • https://gojufoviwovefu.weebly.com/uploads/1/3/4/5/134515133/5654650.pdfIn PDF document text
    • https://moluxoket.weebly.com/uploads/1/3/2/6/132682852/d1bdee52102.pdfIn PDF document text
    • http://thefortykuti.com/dimeganavepag2n199.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/hgddidX/homescapes_game_total_levels.pdfIn PDF document text
    • https://cdn.sqhk.co/botikavanov/ibiggVI/25173757292.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://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_off000106ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 5028 bytes
SHA-256: 00f0670bd6921cee1dded7d7ed18080ad49232020283208674e0c12f71daed1e
font_01_sfnt_off000117c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C5 11208 bytes
SHA-256: 0d8ee47dd1a3150790f2e0142b97ee0a8892e1ac60d1c7c60adbef4134c6f699
font_02_sfnt_off00013dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEE 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

Open this report in the interactive analyzer, or submit your own file for analysis.