Malicious PDF — malware analysis report

Static analysis result for SHA-256 d404b8cff59bda5a…

MALICIOUS

PDF

80.5 KB Created: 2020-12-17 06:39:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d92e04da6a291e4b2a64db434ead574a SHA-1: 286cb789877d78d2a0c00b7514eb80cb1466fb93 SHA-256: d404b8cff59bda5a3909b86b107cd3d8a7413342a4c334a543b17d464cef8b53
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to redirect users. 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 a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://traffset.ru/aws?utm_term=tenda+150mbps+wireless+pci+adapter+driver PDF link annotation
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/dozoteg.pdfIn PDF document text
    • https://pepuzategazeg.weebly.com/uploads/1/3/1/4/131453576/92392f8b.pdfIn PDF document text
    • https://kinojapi.weebly.com/uploads/1/3/2/3/132302846/1848409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450043/normal_5fc154d5596bc.pdfIn PDF document text
    • https://zunesevofulopu.weebly.com/uploads/1/3/4/3/134385883/2790041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375909/normal_5fb5cf886d714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_5fbedf36668f5.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/kuwufi_wekas_sikegotulu_libuk.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/gotijejaj/fojonolufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b981fe0a-3c60-4c48-bc38-8236f7ee0c2e/84173976957.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/75090207859.pdfIn PDF document text
    • https://s3.amazonaws.com/pusumowi/putlocker_the_raid_redemption_subtitles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74727d21-686b-48c4-bf64-e21b797d5f7b/richardson_isd_dyslexia_jobs.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_off0000f1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F6 5780 bytes
SHA-256: df798cccbd944d049408d1d0af21fd247b86f8edc720c1c6ec71dd480b1a4fa7
font_01_sfnt_off000105a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A2 15008 bytes
SHA-256: cf8616cde75d89ffaa7a342861eba0f2a9756b7243cefd4d70527d455e1d15a8

Open this report in the interactive analyzer, or submit your own file for analysis.