Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ecf255d14d107d…

MALICIOUS

PDF

73.3 KB Created: 2021-03-02 12:46:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 809627b12937e9b8ad15792101127de7 SHA-1: 5fe9d9b42dab23a3a5c4aed70d34fdbd3ddfe1c2 SHA-256: a4ecf255d14d107d38362c48554fffaa359769e228d0ebdb6eb7f7501b3303a1
126 Risk Score

Malware Insights

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

The PDF file contains embedded links, one of which points to a suspicious domain associated with malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a payload or phish for information. The presence of external URIs and link farm heuristics further supports a malicious classification.

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://soxebez.ru/wix?keyword=animal+crossing+mod+apk+3.1.2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379960/normal_6018f7862af3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422879/normal_5fdd9dbec3f7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388280/normal_5ff6206f05227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387417/normal_60186ae0a0e63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449417/normal_5fcf4ab9b5301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405895/normal_603cfe0bb5c11.pdfIn PDF document text
    • http://fijexojor.getenjoyment.net/game_of_thrones_book_summary_wiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495040/normal_60327845e2b15.pdfIn PDF document text
    • https://cdn.sqhk.co/bozutebux/Lhcghha/nulekumojolaxigobewilep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_600ecafca55c9.pdfIn PDF document text
    • http://sodazetibup.iblogger.org/vexenipalazizawukadezotob.pdfIn PDF document text
    • http://myimperfectmomlife.com/fifty_shades_of_grey_dvd_unverffentlichte_versionmbgue.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mimewimirul.rf.gd/best_version_of_poetic_edda.pdfIn PDF document text
    • http://kafotafuvodalix.onlinewebshop.net/stephen_king_it_book_buy_online.pdfIn PDF document text
    • http://pamegapag.epizy.com/91828603308.pdfIn PDF document text
    • http://sofibimibojas.myartsonline.com/how_to_adjust_resistance_on_elliptical.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_off0000df68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF68 5828 bytes
SHA-256: 546b7925db7d20a5d441851ac05389004b41566efc228d5b38005baddbdf77a4
font_01_sfnt_off0000f32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32C 10456 bytes
SHA-256: 6610423b93f63d919ffae5f7c56248162e6274b0eac659c9a33a35782d42b65f

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