Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81693d77037f9c1…

MALICIOUS

PDF

72.0 KB Created: 2021-02-14 03:28:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c18a33d9f9fb15b6cf332466313241d7 SHA-1: 743e228280dfa1be1611f02b91c4ef44bfce58ac SHA-256: c81693d77037f9c19801c24d0ed3c7c99b0ec55cd0706b3723c8fa946e10b7ce
184 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to "Jeep grand cherokee parts diagram pdf" to entice users to click the malicious link. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/123?utm_term=jeep+grand+cherokee+parts+diagram+pdf In PDF document text
    • https://cdn.sqhk.co/jifigetuxu/bjdu0Ls/48609956110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474218/normal_5fd8a04d3be3c.pdfIn PDF document text
    • http://extrameets.fun/gazuzlb74v.pdfIn PDF document text
    • http://tugrull.com/83803225880cpnk0.pdfIn PDF document text
    • https://jotozorofelafik.weebly.com/uploads/1/3/1/4/131405965/7292529.pdfIn PDF document text
    • http://ita-fitness.fun/lisadugujevitamugowuzagknj9o.pdfIn PDF document text
    • http://greyfruit.space/divuzojupofujekiwb4mp9.pdfIn PDF document text
    • http://helpverifedbadges.com/14340723208g6g9l.pdfIn PDF document text
    • https://cdn.sqhk.co/kitatoze/fmgdhi4/48642262487.pdfIn PDF document text
    • http://genoray.pro/zogilgfd70.pdfIn PDF document text
    • http://mediaverifiedbadge.com/nsw_off_road_racing_calendar_2020ua0j4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367919/normal_5fe132e72347a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416514/normal_6012885aca135.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420915/normal_5ffb12e732807.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/95da28de9504c69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://degefoxovovi.epizy.com/gatikinu.pdfIn PDF document text
    • http://jizuwugi.rf.gd/gaming_tablet_android_7._0.pdfIn PDF document text
    • http://webubop.rf.gd/76398634614.pdfIn PDF document text
    • http://gowatane.rf.gd/aaru_mp4_hd_video_songs.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_off0000dac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC6 5588 bytes
SHA-256: 3e0b9395229f6194b36c0a3450d0fccd174bd3f2851d82d81bfcf108644c5a85
font_01_sfnt_off0000eda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 10908 bytes
SHA-256: 56f3a2064606027ec1dc2c0b7078c36db6bfc0630c1edc7b3a0f04cd469ea53f

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