Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4160ca83252d3f3…

MALICIOUS

PDF

82.6 KB Created: 2021-05-12 18:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e6ab849159befe0dcc5186f14955c518 SHA-1: 958ca08e4d19c1b191fbe8853f923ac94981e325 SHA-256: e4160ca83252d3f357b9f4335ce560cf602449e0ad51612514a105d1def8178c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://crophysi.ru/strik?utm_term=nikon+coolpix+s4000+battery+exhausted PDF link annotation
    • http://nowtorrentz.com/147183520670eprp.pdfIn PDF document text
    • http://rikafitamedad.medianewsonline.com/laws_of_black_body_radiation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403539/normal_606c3e35233e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450337/normal_60373a5e44aff.pdfIn PDF document text
    • http://toportt.online/gba_sp_ags_101_colorsljxo7.pdfIn PDF document text
    • http://femuxeririta.mygamesonline.org/antenna_fundamentals.pdfIn PDF document text
    • http://subumobo.22web.org/irregular_verbs_past_tense_word_search_answers.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/sivexutujexodadugu.pdfIn PDF document text
    • http://magnifioco.site/neon_stack_blaster_smash_helixal5nu4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376609/normal_6046ad0fcbf79.pdfIn PDF document text
    • https://sepiximefajo.weebly.com/uploads/1/3/4/8/134849953/zezuveliwetuwulagux.pdfIn PDF document text
    • http://tewatag.medianewsonline.com/analogy_for_ssc_chsl.pdfIn PDF document text
    • http://denarop.22web.org/audio_cutter_free_softonic.pdfIn PDF document text
    • https://duxetaxegijojem.weebly.com/uploads/1/3/4/8/134870405/e3bc5cf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448985/normal_602387688b2b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498801/normal_604b696a01944.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_a475a590a13546799ff6bfe9827a319e.pdf?index=trueIn PDF document text
    • http://tabavujafus.epizy.com/importance_of_organic_matter_in_soil.pdfIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_0f653eb4fc56445d9ce3fb7fa0832251.pdf?index=trueIn PDF document text
    • http://gokozir.rf.gd/what_is_another_word_for_programmed.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/centralisation_advantages_and_disadvantages.pdfIn PDF document text
    • http://panexorumilogim.myartsonline.com/13954205238.pdfIn PDF document text
    • http://liduzanakisuta.rf.gd/boziwosim.pdfIn PDF document text
    • https://60b161a2-b511-46bc-b48c-7ca4331f2db3.filesusr.com/ugd/34b71b_edc7c79bf50749f0bf5973118b8ef780.pdf?index=trueIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_999879e13a5d4ecc87c703b2fbd888a4.pdf?index=trueIn 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_off00010468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10468 5736 bytes
SHA-256: 85fc11815afdd9a994b28d57ed8b42cdb886c213c84d1b3fc107810d7250d7f9
font_01_sfnt_off000117f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F9 10752 bytes
SHA-256: 7fc99678975ff7e228a97b6fe3ab37739d2dc545684e33bd7565e67285b5e72c