Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d41f06687596a6…

MALICIOUS

PDF

78.2 KB Created: 2021-02-15 03:19:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ce3bab05c2ab44e27ac4277250f67d03 SHA-1: b63ffa4980d074113436c0ce5b25bb297d873966 SHA-256: 23d41f06687596a655f8153bfff52e97429b4ff5e867ad907a54ce7a879677e2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The document exhibits characteristics of a phishing or social engineering attack, specifically a 'Recovery secret / private key request' lure. It contains numerous embedded URLs, many pointing to disposable domains, suggesting an attempt to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to harvest credentials or sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://jottigo.ru/wix?keyword=is+bay+area+capitalized PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476420/normal_601d989204428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455377/normal_60248bdf72597.pdfIn PDF document text
    • http://uspeh.icu/mavituxanufoxikolodine8ezvf.pdfIn PDF document text
    • http://startovaya.ru/anandam_movie_hdn1z86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425772/normal_5ff570d3e7ce3.pdfIn PDF document text
    • http://revershjtb.site/move_data_from_internal_to_sd_card_androidez0at.pdfIn PDF document text
    • http://terem.space/85149797622nnusz.pdfIn PDF document text
    • http://5-euro.info/646599870613rskw.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/SqjcWoA/pinuvidafumegatabog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369185/normal_5fc7d3b43c7b5.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/gdijFs4/zozuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dudijujixafag.rf.gd/pogisazitiguxe.pdfIn PDF document text
    • http://jitimixilu.epizy.com/spanish_colors_worksheet_high_school.pdfIn PDF document text
    • http://dabixuri.rf.gd/21005478326.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/tales_of_berseria_character_cards_guide.pdfIn PDF document text
    • http://noxanaviki.rf.gd/song_boney_m_rasputin.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_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 5296 bytes
SHA-256: ee8a7097fd6b044e3eaf6f6f14869c5c7517d04d698bc1330287d95918e0533d
font_01_sfnt_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 10056 bytes
SHA-256: f818bf063cc89062ebd55393db4e2e72864bba25592b1f079047e076970847e2

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