Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a94166e6542a31…

MALICIOUS

PDF

77.4 KB Created: 2021-06-05 00:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 18c8c965f2b7036e3e71bb2934628109 SHA-1: e875626fd16cd4ddd35a0a4e03840129321c5f5b SHA-256: 38a94166e6542a31ed5d7d681f224b2219044a743841ede0dc85cc1be2ed8e35
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL leading to a domain associated with phishing and malware distribution. The document body, though heavily obfuscated, appears to be a lure related to game downloads, aiming to trick users into visiting the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://crophysi.ru/123?utm_term=best+shooting+games+for+android+offline PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414153/normal_606a8d76a2d21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475988/normal_5fe7977317bb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410694/normal_6025e665296e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486199/normal_6017fa6acad25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369626/normal_5ff1b4dca631b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469841/normal_602039c0567fb.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4465559/normal_60b71ef2ae27b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_60112629ab22f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459162/normal_602fe7fd41b97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://matekid.pbworks.com/f/30696866640.pdfIn PDF document text
    • http://lokuwulixit.pbworks.com/f/79293845171.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/w/file/fetch/144458538/78293059798.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/f/disujiriwim.pdfIn PDF document text
    • http://gutupum.pbworks.com/f/41516768370.pdfIn PDF document text
    • http://redelaw.pbworks.com/f/apk_editor_pro_free_download_no_root.pdfIn PDF document text
    • http://dadilotofexi.pbworks.com/f/comparative_and_superlative_adjectives_and_adverbs_test.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/f/80096571974.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/f/financial_accounting_1_valix_solution_manual_2016_free_download.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/f/bamuwujupiludeba.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 5156 bytes
SHA-256: 449faa34de66d5241e66edbde6aea07da053051fc629a201444af10c31462910
font_01_sfnt_off0000f6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 10432 bytes
SHA-256: 692ef0a0015c4677ffc21df5bf0a407575a02d623c0df607dd00996b0998d856
font_02_sfnt_off00011a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A62 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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