Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab516992be03a5c…

MALICIOUS

PDF

72.2 KB Created: 2021-02-22 06:08:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 8af476e701eb5c6266abec287ed0d0e7 SHA-1: 3ee643ea704023a2e76ccd9b2f336a73517027f3 SHA-256: 6ab516992be03a5ce95e652d5b4d57b2f851d2a3f31d952d5b79ce2f1a5276ae
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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=how+to+write+a+good+objective+resume In PDF document text
    • http://hookup157.site/ntpc_exam_question_paper_2018hiloh.pdfIn PDF document text
    • http://zelolugo.22web.org/4419725617.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/72HjEC6/9284004948.pdfIn PDF document text
    • http://uabiomanix.xyz/14781084132785ct.pdfIn PDF document text
    • http://prizinsta.online/challenge_2_kolkata_moviekp2pi.pdfIn PDF document text
    • http://floradoma.net/zobebibifagoktx0ef.pdfIn PDF document text
    • http://g2am2e.xyz/dth_hammer_manufacturing_processs95av.pdfIn PDF document text
    • http://zoomita.fun/scholastic_success_with_grammar_grade_5_answer_key9va4t.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/fR3idie/hit_the_reset_button_meme.pdfIn PDF document text
    • http://distornyup.site/texas_longhorns_ncaa_basketball9t389.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/mCxihjh/marunuwoxuposut.pdfIn PDF document text
    • http://afracheat5.xyz/vijibonokrsd7h.pdfIn PDF document text
    • http://opit.space/54771588486xnp1d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://datidogebe.epizy.com/fezam.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_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 5556 bytes
SHA-256: b97b388af160d89bbd1c1d33435371c4d28f4095e413c4eae6708429ff7bee40
font_01_sfnt_off0000f1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BF 10012 bytes
SHA-256: 8966d14f9f224f770d7a00b37c357ea6e755a102c942629a36130c06eb93c7fa

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