Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ba3f5cbd9b1090…

MALICIOUS

PDF

63.6 KB Created: 2021-01-28 04:45:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a55ca85f85163c6bebe546f20e0df90b SHA-1: 70127bfe18375f9f2e65d907ba3067e512eeb702 SHA-256: c9ba3f5cbd9b1090f6c5c57607777ada27f004d19d317216e6550aff91455a64
166 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm with numerous external URIs, including suspicious domains and disposable hosting. The PDF contains invisible links designed to lure users to potentially malicious sites, such as http://managerprogram.live/drowned_river_valley_crossword_cluen2t3y.pdf, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://druttle.ru/123?utm_term=comptia+it+fundamentals+study+guide+pdf PDF link annotation
    • https://cdn.sqhk.co/gemadaruvow/0jiWgdd/dead_trigger_2_apk_obb_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xibexowufifu/0L2jhhj/bikapigugerumufuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380692/normal_5fcd284acd4aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449600/normal_5fd65bec54231.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/V9MgioO/rise_up_lazarus_lyrics_cain.pdfIn PDF document text
    • http://table-wait.com/yellow_pages_book_202082hdc.pdfIn PDF document text
    • http://qunit.space/tawafebexolafoxiteremuba4i0t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_5fdc2741040eb.pdfIn PDF document text
    • http://unosital.space/online_bill_check_lescovzkgp.pdfIn PDF document text
    • https://cdn.sqhk.co/sabepakofo/iahvM3D/traffic_accident_reconstruction_fricke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421218/normal_6010fe12b465f.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/ic46ief/ice_cream_blackpink_dance_mirror.pdfIn PDF document text
    • https://cdn.sqhk.co/vameduvide/jjdhggh/missing_411_hunters_stories.pdfIn PDF document text
    • http://ourfanz.com/482046410833fbmx.pdfIn PDF document text
    • http://stroymarketmetal.ru/onkyo_hf_player_unlocker_ioskv7og.pdfIn PDF document text
    • http://managerprogram.live/drowned_river_valley_crossword_cluen2t3y.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://xogonat.epizy.com/dosiju.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_off0000b1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C1 5272 bytes
SHA-256: 090f2f1276247c060aaad4610278b477e3538418684e0c9c36b48b2f9bdf3ef2
font_01_sfnt_off0000c3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A6 9224 bytes
SHA-256: b86b10cafb0775ee49e9bd5f60c4db86f7cdbde27610c028fe9ea23bf74d4e93
font_02_sfnt_off0000e336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE336 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f