Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d3270c32f25ed9…

MALICIOUS

PDF

79.6 KB Created: 2020-11-23 15:45:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 51a180bfd8cac78db029b15ac4002dae SHA-1: 2d5b51e9d9afbc7eeb25abf1601d8cdf1df0df13 SHA-256: 17d3270c32f25ed942b3181d81b2261507f461cd348d08d07afe91f0a484835a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious 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://traffset.ru/strik?utm_term=lease+agreement+format+in+hindi+pdf PDF link annotation
    • https://jotitotibewava.weebly.com/uploads/1/3/1/3/131383271/mawumurosu_dazijerudo_pitumiwajalome.pdfIn PDF document text
    • https://kavimexidulivi.weebly.com/uploads/1/3/4/0/134040988/0d1009e17222.pdfIn PDF document text
    • https://bozofuki.weebly.com/uploads/1/3/4/3/134322044/gujadutazeba_fagirun_tarezizasozup.pdfIn PDF document text
    • https://pepuzategazeg.weebly.com/uploads/1/3/1/4/131453576/ronifovujaki-vexof-sepaloten-ledaxibojerumo.pdfIn PDF document text
    • https://rapokivagifo.weebly.com/uploads/1/3/4/3/134338569/40c2f0936bd8a.pdfIn PDF document text
    • https://dipapira.weebly.com/uploads/1/3/4/6/134610741/87cc0.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/1073556.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/jaxesabi/7th_heaven_theme_song.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/nebefe.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/nadosunabowoniwamugazotek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cb8d109-b8b5-4da4-b50e-c7be8350b105/kagisutor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97653121-85db-4d99-8e8c-c58df566b80b/49245295077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd23141f-2830-424e-b767-02d205f98960/18163796162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71477460-1659-4ec8-915f-032d0a43a4f3/la_chvre_de_monsieur_seguin_ce2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c100d218-69af-404c-a961-f4e5d23f6479/92126906511.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 2828 bytes
SHA-256: 85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f
font_01_sfnt_off0000fc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 5364 bytes
SHA-256: b48ba7265f8545a5a9d8fd54ab6de9e69e26a8d8b37e61d6e244d4f4d7cc126e
font_02_sfnt_off00010eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAF 10068 bytes
SHA-256: f52bfde00b134ab70a4b39f759af93b97628e7797e4ce227c0638a4366cf7ec0

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