Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c8a1c145234a9f…

MALICIOUS

PDF

72.6 KB Created: 2021-03-18 22:30:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: dccfb20c1a86cdc55996eb1af1714c4c SHA-1: ed82e0865d70856ce57fb805084efe5cfb4b4f90 SHA-256: 85c8a1c145234a9fa153e3d9958d49b314cd4ddf9502ff9bd169ae1cce66749d
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous external URIs, with one pointing to 'nipisod.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is designed to host many links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://nipisod.ru/123?utm_term=chloroform+spray+name+in+bangladesh PDF link annotation
    • http://saxozumipelezip.22web.org/free_game_beach_head_2002.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/transplante_de_clulas_tronco_hematopoticas.pdfIn PDF document text
    • https://vozidetuvotivex.weebly.com/uploads/1/3/6/0/136094215/sodumegusifumeb-sikaxo-felekalamof-namijogesenuti.pdfIn PDF document text
    • https://xudinenudomojuv.weebly.com/uploads/1/3/4/3/134356320/ripajagugoz.pdfIn PDF document text
    • http://zukesijinizik.mywebcommunity.org/98491369984.pdfIn PDF document text
    • http://xuxuvojetuzutej.iblogger.org/android_app_store_data_online.pdfIn PDF document text
    • http://fegiroxopirez.sportsontheweb.net/how_to_keep_a_motion_detector_light_on.pdfIn PDF document text
    • http://dapajurop.mygamesonline.org/miwonarasakejeg.pdfIn PDF document text
    • https://povefedonigo.weebly.com/uploads/1/3/1/6/131637150/c3a3948dd6.pdfIn PDF document text
    • http://fofoketezifofi.22web.org/pozinabepebasupokovivopi.pdfIn PDF document text
    • https://xakediripikevul.weebly.com/uploads/1/3/4/3/134338645/jeduwebuterisi_kiruzotijoza_sazotoseter.pdfIn PDF document text
    • https://zekasujiminog.weebly.com/uploads/1/3/4/3/134366003/1677125.pdfIn PDF document text
    • https://jovimujokuva.weebly.com/uploads/1/3/2/6/132695493/vazetejefofi_lexazewoginuma.pdfIn PDF document text
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/finifilubodad-fonofetit-simipisu-suxet.pdfIn PDF document text
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/kivipozi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/602f8ca6-8eac-4728-9c75-1c6d4bb5ff3a/fufuvebavesozupekixe.pdfIn PDF document text
    • http://bakisuv.rf.gd/equivalencia_pulgadas_mm_tuberas_polietileno.pdfIn PDF document text
    • http://vezoxonu.epizy.com/kilowaxawotikinidagez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9d448e6-e41d-4850-90e7-07c456b4c8e3/is_call_me_by_your_name_rated_r.pdfIn PDF document text
    • http://wafubarig.epizy.com/company_christmas_party_invitation_templates_free.pdfIn PDF document text
    • http://nedanitajaw.epizy.com/zijaderumedetixivosowam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d33e10f-c09c-41ef-aa14-f4c0b5623fd2/johnny_appleseed_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b698b2f-c8bc-4c09-9fc9-d764ae082a78/how_to_turn_on_halo_bassinest_swivel_sleeper.pdfIn PDF document text
    • http://mudotepejix.epizy.com/84236976622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4d9bcd7-d013-466b-97d7-ee8788ad48a8/infantino_flip_advanced_4-in-1_convertible_carrier_how_to_use.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8E 5600 bytes
SHA-256: d5909522b4c4f2fcb3897f4f10fb8e1ab3e24cb0b19e8b3aa8ea378996cadc92
font_01_sfnt_off0000ee6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 10844 bytes
SHA-256: c941fa4f0c02575f110e5009f1faf7cba181f076b1f0335778c3d84afa154af1