Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d3204e07d45ed4…

MALICIOUS

PDF

72.5 KB Created: 2021-02-25 18:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 18db232a5de96af48e94d6aa7eb84dd8 SHA-1: 8864b745ae55fc86c1527cc1ebb65353655632a1 SHA-256: 72d3204e07d45ed49dd5251398a1212aecb0274351bfed5e69d52341025fddc3
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially corrupted, contains text related to a 'monografia corta para niños de primaria', suggesting a lure to disguise the malicious links. No scripts were extracted, but the presence of malicious URLs is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=ejemplo+de+monografia+corta+para+ni%25C3%25B1os+de+primaria In PDF document text
    • https://static.s123-cdn-static.com/uploads/4489429/normal_5fc6160c01916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_5fe7d815c7c46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404990/normal_60249630e3862.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390330/normal_5fc6b00258abe.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/icagdje/48141431654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403952/normal_600ba9a27c037.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479691/normal_5fcfac73b2b1c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duxegejuw.atwebpages.com/37391907429.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/tugixad.pdfIn PDF document text
    • http://kunerev.epizy.com/mkx_krypt_guide_brutalities.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/55088766761.pdfIn PDF document text
    • http://lufubafuma.epizy.com/which_hedge_funds_beat_the_market.pdfIn PDF document text
    • http://tolitaxolumupu.rf.gd/26192706816.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/zafapinadomeb.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_off0000db43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB43 5720 bytes
SHA-256: 88fe0fa4db02a7c35d2857b5d8dd778546a60173f1002688f6d44d982248d20a
font_01_sfnt_off0000ee71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 11132 bytes
SHA-256: 71d6f866c720cdcd059197e619e5a921d311f1c9525aa9467e27eb1490554fd9

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