Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d2362bda2082ce…

MALICIOUS

PDF

73.1 KB Created: 2021-02-04 04:41:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b9f1d040787c16a84d7fd026bbc99435 SHA-1: 36e1813f180f05d5dbf8523576661b8dbe8e05cf SHA-256: 62d2362bda2082ce0d89e7f7365064ca3e7a389004a547863340b65a0e88ddca
192 Risk Score

Malware Insights

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

The PDF contains multiple links, with one specifically identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded URLs and a 'download button' heuristic further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=badoo+app++iphone In PDF document text
    • https://cdn.sqhk.co/kawinojos/jqnhcwh/fepota.pdfIn PDF document text
    • https://cdn.sqhk.co/zijikunu/hae0Fsa/crash_race_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/hgGN0on/wells_fargo_mobile_banking.pdfIn PDF document text
    • http://freud.icu/wibutinuftt239.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/Pbhhic6/papers_please_free_play_online.pdfIn PDF document text
    • http://curvepreloved.com/81547975332rzfvc.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/hlgcKvA/serajamubidujolokuv.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/ihdRghb/defender_3_hack_apk_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ferodokibaw.epizy.com/dichotomous_key_worksheet.pdfIn PDF document text
    • http://zijikekiz.epizy.com/mrp_online_application_form_bd.pdfIn PDF document text
    • http://rufeluvogoweva.epizy.com/valakasaw.pdfIn PDF document text
    • http://penotumupemu.epizy.com/present_perfect_tense_worksheet.pdfIn PDF document text
    • http://bezopiwuzalobit.rf.gd/american_law_reports.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_off0000e3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AB 4792 bytes
SHA-256: 3b0771b5c92df0d66f8ccd9ecdb4a2dd19a2a5f9b629d92f28135fda765e0054
font_01_sfnt_off0000f3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 10724 bytes
SHA-256: 295244ab41b4c11e3ab98d854ab7d5d187646a205f8d6908b77fd9f1888c74c5

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