Malicious PDF — malware analysis report

Static analysis result for SHA-256 585c1a3e6db11a9c…

MALICIOUS

PDF

75.5 KB Created: 2021-02-15 05:30:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f8240e0353ffbe82ac6922e848b796f2 SHA-1: 94fffc47199c3a4bb0cd82caa31fc2805ee20eb6 SHA-256: 585c1a3e6db11a9c4fe8a83f739a8c96644adc922227fc6814c1dadc6f39350f
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of numerous links suggests an attempt to redirect the user to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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=panera+salad+dressing+asian+sesame In PDF document text
    • https://cdn.sqhk.co/buwowunuras/egg4kaA/76743334511.pdfIn PDF document text
    • http://thiswaytovogue.com/volkswagen_fiyat_listesi_202041w9o.pdfIn PDF document text
    • https://cdn.sqhk.co/sinupupuzaxa/cjahhgj/idle_island_build_and_survive_mod_apk_download.pdfIn PDF document text
    • http://sreview.online/firofamukerufaxasaxir1u2h.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/hcxMggx/49451925561.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/sketchup_pr_2016_mac_nmero_de_seribb3s2.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/d2iPLwF/tropico_5_how_to_declare_independence.pdfIn PDF document text
    • http://naturaitalia.space/burrows_wheeler_transform_paperwevn3.pdfIn PDF document text
    • http://xagelofitu.22web.org/54942113659.pdfIn PDF document text
    • http://spainsale.pro/resident_evil_7_21_characterse5vh0.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
    • https://s3.amazonaws.com/fulosobezur/cricket_game_button_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/novesela.pdfIn PDF document text
    • http://tasodeporojunez.epizy.com/vadokamus.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/wowifasan.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/faket.pdfIn PDF document text
    • http://pawiruf.rf.gd/coreldraw_x6_with_crack.pdfIn PDF document text
    • http://temekem.epizy.com/application_forms_for_nsfas.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_off0000de9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 4744 bytes
SHA-256: 0b5d684b4ff28c81857ebd77b9acfca046e582fa0388beaf5ab999fe6146bc8a
font_01_sfnt_off0000ee81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 10632 bytes
SHA-256: aae7cdec4350055f3fec5a454b73d74d3a0887a6ce0ce138ed221d7b80a80708
font_02_sfnt_off00011271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11271 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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