Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68b7a85d60c8e73…

MALICIOUS

PDF

62.4 KB Created: 2020-11-24 02:46:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3deb1d3295bfbaf3332b168d1da42e9a SHA-1: bb7b029fe2899d3d4259a9b14c5a6ee0d92de4be SHA-256: f68b7a85d60c8e7352e08d2ddce4b5a4dc0727f7c6ea7778528b29e439e351d2
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a lure document generated by a tool. No scripts were extracted, but the presence of malicious links is sufficient evidence of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffking.ru/aws?utm_term=basha+movie+ringtone+free In PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/717030.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/xumupafav.pdfIn PDF document text
    • https://rajexomogalifi.weebly.com/uploads/1/3/4/8/134891851/xejebiwok.pdfIn PDF document text
    • https://rixidagetowema.weebly.com/uploads/1/3/4/6/134612143/739788fca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1959623-60c1-4bde-9dbf-03501216105d/34567497380.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/eldest_ita.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/24353764392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de398d3d-9340-410e-8463-5b82ce86f9ef/61528956133.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/princeton_review_new_sat_practice_test.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/free_books_online_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/december_2017_international_sat_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/67501653831.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/star_spangled_banner_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/skammerens_datter_ii_slangens_gave_2019.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_off0000b69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69E 5260 bytes
SHA-256: 8def06278d412319341e026fd44a1d877d24f122aef2b1bdad2cc6abe17ea696
font_01_sfnt_off0000c861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC861 10748 bytes
SHA-256: b287d2c172637a04a05cc69ab796d585453797ddf31c208ea2ce398eea043439

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