Malicious PDF — malware analysis report

Static analysis result for SHA-256 649a11a736b0afb4…

MALICIOUS

PDF

79.3 KB Created: 2021-03-01 15:47:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9291562417958a60ef62c83023aa58b7 SHA-1: 9f2f1f244defb1d6327f30ae09823c75981725d0 SHA-256: 649a11a736b0afb477b669e7773a43b70be615e6fca6b9be7913e792389df2ee
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically targeting the URL 'https://crophysi.ru/strik?utm_term=program+management+interview+questions+facebook'. This suggests the document's primary purpose is to lure users to this malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL and the nature of the redirector point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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=program+management+interview+questions+facebook In PDF document text
    • http://cookwellbakewell.com/54654511602gulv5.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/ijRnUjd/wikuxuz.pdfIn PDF document text
    • http://tasenedujusinu.iblogger.org/free_email_list_2017.pdfIn PDF document text
    • http://moledibatu.22web.org/oster_20_qt_roaster_oven_manual.pdfIn PDF document text
    • http://show-visitor.xyz/mimogekimirebegunixopuliv2ju06.pdfIn PDF document text
    • http://idealicaufficiale.website/delonghi_air_conditioner_heater_manualzl2gu.pdfIn PDF document text
    • http://piludid.22web.org/37993309400.pdfIn PDF document text
    • http://macsk.space/buku_filsafat_pendidikan_islamt9puo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xuvamuba/85953005505.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/adventure_island_4_in_1_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/los_verbos_ms_usados_en_ingls_en_todos_sus_tiempos.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/duval_county_jail_booking_report.pdfIn PDF document text
    • http://saduxax.epizy.com/dimagezabuzuwut.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/zamofuwobemivumi.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/20949858532.pdfIn PDF document text
    • http://bolunivagoxel.epizy.com/44741730684.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/71591295385.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 5532 bytes
SHA-256: e017b61ff5cc7bbcb1931c3cafcec1f786b21df57926bb4f382366128c3c4d78
font_01_sfnt_off0000fd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 10884 bytes
SHA-256: bbc3dd22448f1cc272160d479daa5a3585b8f781997a3439374a13b12b4c6d3a
font_02_sfnt_off00012185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12185 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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