Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea08f88de3afbaaa…

MALICIOUS

PDF

80.1 KB Created: 2021-02-21 17:19:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 135b09dacf96f152001fabc8f18bc9a5 SHA-1: d3f9b0aaac9171a87c59d59220cb053064a7680f SHA-256: ea08f88de3afbaaad2f13b2cc7ba9e1ff87ec094a7bc58c5efc7f4f7ca3057fb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one prominent URL pointing to 'jacksth.ru', suggesting it's used to redirect users to a potentially malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to host multiple links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jacksth.ru/123?utm_term=the+50th+law+of+power+review PDF link annotation
    • https://cdn.sqhk.co/tuwetebep/gdFjgn8/jackbox_party_pack_5_ps4_review.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/hgf7mhb/basketball_stars_2016_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5fd6a18f5d5ad.pdfIn PDF document text
    • http://dvestideyli.xyz/exercice_sur_le_calendrier_ce2nayo3.pdfIn PDF document text
    • http://antonioita.fun/sasosugofg8wh.pdfIn PDF document text
    • https://cdn.sqhk.co/dadakafopina/jghhhig/age_of_clash_of_clans.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/g2a3rhf/hashtags_for_likes_and_comments.pdfIn PDF document text
    • https://cdn.sqhk.co/vekasurox/1sMqjfJ/70_diy_pallet_ideas.pdfIn PDF document text
    • http://in-step.shop/wudeluxufimowakoxupaeho04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365542/normal_5fcbaddfc1561.pdfIn PDF document text
    • http://letgtma.bid/pijododoxulozovogeranaxisvird.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/jgOjghi/sony_ps4_controller_apple_tv.pdfIn PDF document text
    • http://fabulouss.space/bekisunerilerogikuiwiht.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xinasewaja.epizy.com/wevomenol.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_off0000fc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC70 5180 bytes
SHA-256: 6a6ac3278b1cefa2f2e99ff2ca79567010a87583675cba07635aad5ca9f27160
font_01_sfnt_off00010e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2C 11052 bytes
SHA-256: 9791aff9fa19c2469c515fafddcca38dbff7fd9e02de016e51d244928c363789

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