Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e12021f65e9dc34…

MALICIOUS

PDF

78.9 KB Created: 2021-02-20 15:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2b95dd1bca6b60c18f11f4e43eff4042 SHA-1: 8c0735bcdcff3411a4e08f6d72b67e418a0b398c SHA-256: 6e12021f65e9dc3444a3a4c2d8eff4aa819f2bfe5e4480d0145540ecc856931b
184 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to a URL that promises a free download of "100 deadly skills pdf". This indicates a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing lure identified.

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 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/123?utm_term=clint+emerson+100+deadly+skills+pdf+free+download In PDF document text
    • https://static.s123-cdn-static.com/uploads/4416504/normal_5fcf2dfb873df.pdfIn PDF document text
    • https://cdn.sqhk.co/laxefotogulo/cEcVEDX/34973716199.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/ehbTdhc/95430049461.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365536/normal_5ff407350348d.pdfIn PDF document text
    • http://dreamingdeveloper.com/97377018358mtdjc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468537/normal_602982d6a4734.pdfIn PDF document text
    • http://xivitej.66ghz.com/vba_vlookup_multiple_sheets.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/vjgL1jj/doomscrolling_hidden_brain.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/GUjbhhw/nijipedateneg.pdfIn PDF document text
    • http://onesmall.space/374102993278n9wq.pdfIn PDF document text
    • http://topcreditcheck.info/what_is_the_purpose_of_injury_lawyeru209u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476427/normal_5fd3a19bbd46f.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/sajezife/minecraft_luffy_skin_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/determining_spinner_probability_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/video_editor_mac_free.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 2884 bytes
SHA-256: 7de888e44ffb5e34b0b5632d5b60970ccc58cd29d9e00c4f8ad56ade75981154
font_01_sfnt_off0000e878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE878 5448 bytes
SHA-256: 11dc309d5ed5204d9f439e967a7af938713f530df70ff963e424cd4c44b8f663
font_02_sfnt_off0000fb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB00 10804 bytes
SHA-256: cb19b4309185a90131655731a48d740fc762a209db19ae88134c0433dbebc268
font_03_sfnt_off00011f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F62 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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