Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb26712220213a5c…

MALICIOUS

PDF

74.5 KB Created: 2021-02-14 00:41:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: abfb68920e45f9dbc265795338951ae7 SHA-1: 16f2810920594ff7403a77185ae6b73a31adc9ea SHA-256: cb26712220213a5c38ec2cc9fa4836d3b2b76954ce2e3d90f53359e0511312ee
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that point to a link farm hosted on disposable infrastructure, with one URL identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=geoff+peterson+dexter In PDF document text
    • https://cdn-cms.f-static.net/uploads/4464065/normal_601c5e74c17f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464871/normal_5fec8e90eda42.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/e96jjgh/residence_inn_north_conway_pet_policy.pdfIn PDF document text
    • http://powerpoint4you.ru/play4keeps_clo_llc66zjb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384308/normal_5fe0200df2546.pdfIn PDF document text
    • https://cdn.sqhk.co/guzikiku/hheaBih/70830012582.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovipawe/ipgeBjT/44661745776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_600e72658018e.pdfIn PDF document text
    • https://turudesufexo.weebly.com/uploads/1/3/4/1/134131379/5742215.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/jasipefulaxiduj/catholic_bible_in_chinese.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/60556404931.pdfIn PDF document text
    • http://monuwuwotivonil.epizy.com/minecraft_cracked_launcher_1._8_team_extreme.pdfIn PDF document text
    • http://podoremekuzepo.rf.gd/line_dance_basic_step_sheet.pdfIn PDF document text
    • http://godarujugil.rf.gd/levabejonukonurukonigexu.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/pusinufeje.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_off0000e74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 4892 bytes
SHA-256: c25daedbe23b41b322e4327b15af48a9e31960adb283865c7103be2f7938e322
font_01_sfnt_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 10916 bytes
SHA-256: 036fa35d71c5ef8d6768f667331135f12d341ac00d39ade64ed59ff78d27d10a

Open this report in the interactive analyzer, or submit your own file for analysis.