Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e43a1cacd5e53d9…

MALICIOUS

PDF

75.9 KB Created: 2021-03-27 20:13:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a8821e2483520f5388328e3afe0d4375 SHA-1: 06420c8b2f8ca1b597f9430d41349ecf7832a319 SHA-256: 1e43a1cacd5e53d99813708182aac2e66da5bdc0813a28362a63c5c4589b3b0e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links to other PDFs hosted on disposable domains, suggesting an attempt to manipulate search engine results or distribute further malicious content. The presence of embedded URLs and the overall structure strongly indicate a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/award?keyword=upsc+ansar+shaikh+book+pdf PDF link annotation
    • https://tiwuvaxitunux.weebly.com/uploads/1/3/0/8/130874175/7359197.pdfIn PDF document text
    • https://pogiwaxo.weebly.com/uploads/1/3/5/3/135312355/3815260.pdfIn PDF document text
    • https://wugarusuxota.weebly.com/uploads/1/3/0/8/130814120/8415716.pdfIn PDF document text
    • http://tazasimeli.22web.org/42515670660.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/hfiehhE/coffee_inc_game_walkthrough.pdfIn PDF document text
    • http://lagulatobir.iblogger.org/18800701460.pdfIn PDF document text
    • https://daxolefuziru.weebly.com/uploads/1/3/5/9/135963055/genogimegegitu.pdfIn PDF document text
    • https://tefakunuti.weebly.com/uploads/1/3/1/8/131871494/fepefuro-setizaf-ximup-sexix.pdfIn PDF document text
    • http://fenemixov.iblogger.org/graco_sweetpeace_swing_replacement_parts.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/veg_recipe_of_india_chilli_paneer.pdfIn PDF document text
    • https://cdn.sqhk.co/fezifoxunif/GhJhchh/nestle_drumstick_ice_cream_ingredients.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxodokoju/ruiehhc/65347214247.pdfIn PDF document text
    • http://wifunejefasod.iblogger.org/tedixiloro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_3f3210e889824ee98c7ca48087b99b81.pdf?index=trueIn PDF document text
    • http://winixugerefubu.epizy.com/kasanawugagejagur.pdfIn PDF document text
    • http://sovodesad.rf.gd/what_city_does_evil_take_place.pdfIn PDF document text
    • http://bameromaxaw.epizy.com/52769195906.pdfIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_cd6eb2b20ca94db3879e107e1128bfd8.pdf?index=trueIn PDF document text
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_a20ff9364a414d4cbf20e6c5459226c0.pdf?index=trueIn PDF document text
    • http://wesekavuxojox.epizy.com/69431475029.pdfIn PDF document text
    • http://mawokale.myartsonline.com/18924744629.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_off0000deb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB1 5408 bytes
SHA-256: 080632a22039bac99f4964813c459c708ec838462ba03d9d1c00d72870fc9830
font_01_sfnt_off0000f104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF104 2504 bytes
SHA-256: 123b1ab14fb65fa98a494cb875f9718bd41ec25ef62475bfa64e60647bdfa566
font_02_sfnt_off0000fbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 11220 bytes
SHA-256: 2a9eb0e2a08152d76fec8a59cc23c2d8aaa5399bb6164de0d89c0c15872dbc7a