Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4488bffbc16714…

MALICIOUS

PDF

72.8 KB Created: 2021-02-16 17:46:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 153970c7c33558b83dff960d759c6264 SHA-1: beaecbe82de84bf4a9642a087a148e4a32122486 SHA-256: 1d4488bffbc16714ba58da46fa2f73ed41a89bf3ac15a07de9baee42ca17ec43
192 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though garbled, suggests a lure related to employment records, aligning with the SE_INVOICE_LURE heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/wix?keyword=employment+records+request+form In PDF document text
    • http://teenagetutor.online/xiximoteziruzanabenumuspjw4.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/jhwgdsO/rejejutonuvipo.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/VgiyFji/denanozinevi.pdfIn PDF document text
    • http://basiditdcf.space/xuwexalipitifagulopubefu8khbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375355/normal_6001d4a64623d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383687/normal_5ff80f50a371e.pdfIn PDF document text
    • http://vovpomnim.ru/hand_reflexology_chart_for_knee_painsr9kg.pdfIn PDF document text
    • http://kukushka.space/67047824321cyt34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457296/normal_60036c5c4052c.pdfIn PDF document text
    • https://cdn.sqhk.co/rabuvimi/mApjb3Z/30822343553.pdfIn PDF document text
    • https://cdn.sqhk.co/wuluzajiroz/gfieBjh/8659318842.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/hdjhiie/horizon_city__minecraft.pdfIn PDF document text
    • http://de-bewertung-id2842384.icu/magic_rampage_2-_6544js.pdfIn PDF document text
    • https://cdn.sqhk.co/tasaxasup/PrHidhd/64625658695.pdfIn PDF document text
    • http://hookup154.online/746962737918xi5y.pdfIn PDF document text
    • https://cdn.sqhk.co/wisaputal/bbhdhgr/better_word_for_pet_peeve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393035/normal_5fe02b59ea6ba.pdfIn PDF document text
    • http://hopecommunitynaz.com/91823445085ogjz1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bejeseja/koxusopupem.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/79497258110.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/jigogolebukaterofasof.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/android_google_maps_street_view.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_off0000e0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A0 5276 bytes
SHA-256: b938ef87294d341c240f5fd9b3fe89302683636568333a1416f26583c6c83de8
font_01_sfnt_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 10384 bytes
SHA-256: b5f21b1687eb4d61a4f441a54cecf15115dde12ecd711d5fa4dc985643f49a3c

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