Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4b306dea4060ac…

MALICIOUS

PDF

87.4 KB Created: 2021-03-03 03:33:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1eb72aff151cd41ebd40c1e82c563990 SHA-1: 3ff51f0321fd092eb20ae12d44d43d11823936eb SHA-256: cc4b306dea4060aceeab09f79bbda24bd15d4398592a4ef736027d52e4ab7808
126 Risk Score

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, many pointing to disposable domains, suggesting a link farm or redirection scheme to host malicious content. The document body, though heavily obfuscated, contains text related to a 'Kotor character guide', likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/wix?keyword=kotor+character+guide PDF link annotation
    • http://topcabinets.xyz/stored_program_control_exchange_spcxi8r5.pdfIn PDF document text
    • http://goproonly.com/advantages_and_disadvantages_of_breastfeeding_and_bottle_feedingev8k9.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/LigtAL7/sezafibarutad.pdfIn PDF document text
    • http://urologo.store/the_natural_rate_of_unemployment_is_not_equal_to_zero_because5s5wa.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/how_to_use_a_zojirushi_rice_cooker.pdfIn PDF document text
    • http://premial.su/apache_commons_compress_1._18_jary1dly.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/stock_market_books_for_beginners_in_hindi.pdfIn PDF document text
    • http://ruwemipuwev.mypressonline.com/strong_concordance_bible.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/65239417402.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://nurifedalezonu.rf.gd/japedolasag.pdfIn PDF document text
    • http://nununad.myartsonline.com/10414543401.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/langrisser_banner_guide.pdfIn PDF document text
    • http://sabenimuzu.rf.gd/cancer_de_mama_2019.pdfIn PDF document text
    • http://dezobod.onlinewebshop.net/actividades_de_escritura_para_nios_de_segundo_grado_de_primaria.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_off00010ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBD 4736 bytes
SHA-256: 0ec08e14fdbe930672556d0a47f3fc74e2924c4ee1e15ddfb887848cc46b7f25
font_01_sfnt_off00011eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 10460 bytes
SHA-256: 4e84721c1456af69c96764be6ab6a70366a9bb1c01bb0cedcc0bab5f3fb410e2
font_02_sfnt_off00014282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14282 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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