Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab07f037cb4a11f7…

MALICIOUS

PDF

76.0 KB Created: 2021-06-11 04:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7df2948af421ce68674da74272400f76 SHA-1: 7c17269edba0490ba1a789916ef2fbe8b33e9f2b SHA-256: ab07f037cb4a11f752d383eec2993814e8c21cc87d1f88e025455331b8aae3e9
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is also detected by ClamAV as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate potential for malicious JavaScript execution or redirection to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/123?utm_term=olympiad+maths+questions+and+answers+pdf PDF link annotation
    • https://fikuzafunowu.weebly.com/uploads/1/3/1/8/131857523/divoked.pdfIn PDF document text
    • https://butafujedixixi.weebly.com/uploads/1/3/4/2/134236167/duwotogiketozunu.pdfIn PDF document text
    • https://zoxelokot.weebly.com/uploads/1/3/0/9/130969402/mokogumeruwetugiz.pdfIn PDF document text
    • https://foxekefiki.weebly.com/uploads/1/3/4/6/134666392/c72f8.pdfIn PDF document text
    • https://mopomavimixefor.weebly.com/uploads/1/3/1/1/131164117/a36c903881eb41.pdfIn PDF document text
    • https://tumurotijom.weebly.com/uploads/1/3/4/5/134512141/2555725.pdfIn PDF document text
    • https://jezugazaditok.weebly.com/uploads/1/3/4/6/134601365/putijono_rofipif.pdfIn PDF document text
    • https://jarubobukifali.weebly.com/uploads/1/3/5/2/135297267/wurikovupogiwafobap.pdfIn PDF document text
    • https://jerewetazawupej.weebly.com/uploads/1/3/4/3/134384555/besuxixozus-gosigerivotikov-lirixegaluvede-vawafuge.pdfIn PDF document text
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/aadd79c6d.pdfIn PDF document text
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/dudogejufijabiju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuvebag.pbworks.com/w/file/fetch/144425001/riddle_worksheets_for_5th_grade.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/w/file/fetch/144981183/roblox_auto_clicker_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f868c480-f81c-4e36-8e85-c0a7108d7224/miopia_hipermetropia_astigmatismo_presbicia.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/f/85129914051.pdfIn PDF document text
    • http://joxupakager.pbworks.com/w/file/fetch/144668115/98012566846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72fa46d8-af3b-4201-bbfd-6bb9cd93f08e/cerere_demisie_2018_2019.pdfIn PDF document text
    • http://mijatonevu.pbworks.com/f/skulduggery_pleasant_bedlam_download.pdfIn PDF document text
    • http://pobonagul.pbworks.com/f/simcity_offline_apk.pdfIn PDF document text
    • http://xosezoranad.pbworks.com/f/lodetasur.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/w/file/fetch/144497097/application_for_an_australian_passport_overseas_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7450e606-e592-4742-a3dd-d6f1af185f8b/kizogekejozemeruzujojame.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_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 5628 bytes
SHA-256: 05af97269c239b10ba3eaf41a6f787778e340674033562b15a927af93ea2eef4
font_01_sfnt_off0000fca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA0 10552 bytes
SHA-256: 96f63e7795f9d504cf976b7d4691219497001ae2ff8c72aebd7a29546f9b99b5