Malicious PDF — malware analysis report

Static analysis result for SHA-256 493edf7a8b44f031…

MALICIOUS

PDF

74.5 KB Created: 2021-06-11 04:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6525e633e759852277d8a0912535a488 SHA-1: adc23f31cd0270aaafb9861e507601df82dd5d03 SHA-256: 493edf7a8b44f03102ddd97a94855e741518542ec769a0aa9f873c82b7ecfb60
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of a 'download button' heuristic further supports a lure-based attack. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to malicious sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/pbw?utm_term=granny+outwitt+download+apk PDF link annotation
    • https://surupipenip.weebly.com/uploads/1/3/1/8/131856971/gugenagokofete.pdfIn PDF document text
    • https://jomufoxubibad.weebly.com/uploads/1/3/1/1/131164047/9758021.pdfIn PDF document text
    • https://lirefabagobaxi.weebly.com/uploads/1/3/4/0/134012393/3698644.pdfIn PDF document text
    • https://rupovopijono.weebly.com/uploads/1/3/4/8/134863796/7496181.pdfIn PDF document text
    • https://sevujamipoviku.weebly.com/uploads/1/3/4/2/134234740/2346624.pdfIn PDF document text
    • https://bunogijadijis.weebly.com/uploads/1/3/4/8/134896562/8673663.pdfIn PDF document text
    • https://labudadujuw.weebly.com/uploads/1/3/1/6/131637223/buboso-xuxubikud-furifajiluju.pdfIn PDF document text
    • https://vevorusafe.weebly.com/uploads/1/3/4/5/134516648/somokopox.pdfIn PDF document text
    • https://xuratofojiwob.weebly.com/uploads/1/3/4/0/134096374/4207750.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuxawakaxaz.pbworks.com/w/file/fetch/144903408/16756745067.pdfIn PDF document text
    • http://ralogotuxa.pbworks.com/w/file/fetch/144815427/terraform_iam_role_with_multiple_policies.pdfIn PDF document text
    • http://sakulibur.pbworks.com/f/faux_calligraphy_practice_sheets.pdfIn PDF document text
    • http://rabumofu.pbworks.com/w/file/fetch/145046217/pazugamolevuwujejeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5211e7d2-d723-4504-8f26-856ae29040a5/bepat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2681db8-06f9-4b8f-a523-9b02dda78833/what_does_angel_number_555_mean_in_love.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ab2d23f-45aa-4db9-af72-440e1fdfc997/zukufilivupilazif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe96b3d0-3214-4dd7-8a0f-308620c55678/1416743461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e04e52d4-f779-4ff5-a489-1d0164c06984/xisekobofiro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11e7a6c7-a8fb-47bc-9ad3-de521be2c213/what_book_is_after_warriors_the_darkest_hour.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/w/file/fetch/144692529/bavobovilon.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_off0000e3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A0 5064 bytes
SHA-256: b1da72567a6af22357d951b382ef6dc574b82262438725a60ecb80fa85060165
font_01_sfnt_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 12140 bytes
SHA-256: 9d3d2be7f70920d4f51f8de48703c1ba2f9fb664bb81e544e813bc6be095fe09