Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8435e34381cf232…

MALICIOUS

PDF

86.3 KB Created: 2021-03-01 17:35:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 3afc86452e8ca1b4a2e08583df14ef1b SHA-1: 61a9b5a642f47c0ce30c4660ca0c82409dd3e6d9 SHA-256: d8435e34381cf23202b0bdd187115deeede9432b3f977ab59790dcb15d4284cd
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous links on potentially malicious hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=performance+summary+examples PDF link annotation
    • http://tumbochka.space/4130659452u6f9d.pdfIn PDF document text
    • https://vonasadan.weebly.com/uploads/1/3/3/9/133986887/9899680.pdfIn PDF document text
    • http://noksipals.online/xorodopusepodewefesaluddcyh.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/how_to_connect_hp_deskjet_3050_j610_series_wireless.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/9008332634.pdfIn PDF document text
    • https://xegoratan.weebly.com/uploads/1/3/2/7/132712572/vujixumef.pdfIn PDF document text
    • https://rejukikigukaw.weebly.com/uploads/1/3/5/3/135387704/rirafo.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/zulugabexinatugaxozidevo.pdfIn PDF document text
    • https://jufozawuvinuxak.weebly.com/uploads/1/3/5/3/135326647/joxevopazaboz-fupir.pdfIn PDF document text
    • http://rameautbxy.space/fisifelenafuros3v8sg.pdfIn PDF document text
    • https://jupedozezuwobig.weebly.com/uploads/1/3/4/0/134040413/6b8303293.pdfIn PDF document text
    • http://kewujedirolut.22web.org/twitch_jungle_guide_9._13.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/interior_design_colleges_in_new_yorknpbc2.pdfIn PDF document text
    • http://canonsburglake.com/zoludadanixovotedilugafsb7.pdfIn PDF document text
    • http://wiinorama.space/petsafe_wireless_dog_fence_setupuxgsx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/bless_the_broken_road_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/garmin_gpsmap_60csx_marine_maps.pdfIn PDF document text
    • http://sigafuveno.epizy.com/separolad.pdfIn PDF document text
    • http://wazododasexixak.rf.gd/nogam.pdfIn PDF document text
    • http://xusasun.rf.gd/best_linen_sheets_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/mcgraw_hill_pre_algebra_textbook_free.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_off00011623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11623 5332 bytes
SHA-256: edda3881be4fa00c3ec227cd4bdbd7933d1fdedaba28bf3a800ccc7912e69108
font_01_sfnt_off0001283b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283B 10392 bytes
SHA-256: a67bf6e3a1c9c9735e981fcc9ecd0f004e5095c2d7358aebcbb0b7ccbb79e241

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