Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77d79a067813e8a…

MALICIOUS

PDF

112.5 KB Created: 2021-02-12 20:41:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4a449cb8f9c022c9a2acc3664ac7981a SHA-1: cf6e572cd34bc7e12db84937512d3daa16e698b9 SHA-256: c77d79a067813e8ac5da9363329ef48584218e4c99b481de7f9e0f57afd2eb28
186 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, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to deliver secondary payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://druttle.ru/123?utm_term=lyndon+west+fau PDF link annotation
    • http://fb-ig-copyright.com/aisa_koi_shot_nahi_hai_mp3_song_downvovxb.pdfIn PDF document text
    • https://pelefazefipaguj.weebly.com/uploads/1/3/4/8/134892892/6926408.pdfIn PDF document text
    • http://xadutewopitap.22web.org/felusapexadiwosutak.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/wawin.pdfIn PDF document text
    • https://duxetaxegijojem.weebly.com/uploads/1/3/4/8/134870405/sitomeja.pdfIn PDF document text
    • https://luvofebujapima.weebly.com/uploads/1/3/0/9/130969865/xafumudofepir.pdfIn PDF document text
    • https://neletataw.weebly.com/uploads/1/3/1/3/131398134/d027b8.pdfIn PDF document text
    • https://donedujawag.weebly.com/uploads/1/3/4/3/134315137/323693.pdfIn PDF document text
    • http://inmyshtangen.xyz/ladutabakudapewup4f3q1.pdfIn PDF document text
    • https://jowatewiko.weebly.com/uploads/1/3/1/3/131380225/22e5512388.pdfIn PDF document text
    • http://fastcreditcheck.info/miya_bhai_video_song_bestwapq0xcs.pdfIn PDF document text
    • https://kojemugolipoxo.weebly.com/uploads/1/3/4/7/134729864/1861136.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jexusapije.epizy.com/13729353307.pdfIn PDF document text
    • http://kibululugavi.epizy.com/airserver_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/storytelling_books.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/faxuwezovudawuvamejupipof.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_off00017bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BC8 4908 bytes
SHA-256: 524c30d6daf59b29d8489d9eb4576465bf41c127926a23c53154bab0dde023fb
font_01_sfnt_off00018cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CB1 11884 bytes
SHA-256: 00fcdcbf205ddc482f205c277f77dd2b9c4d743bdf9fe1f0e07597e6f04ae33d

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