Malicious PDF — malware analysis report

Static analysis result for SHA-256 78285f0cdca1f16e…

MALICIOUS

PDF

76.3 KB Created: 2021-02-24 22:37:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ba969c6a7c24bf0653451b809be47efb SHA-1: 7ba8f586016d88e18e06f2ab25b674c491f5eea4 SHA-256: 78285f0cdca1f16e6ad3c2c58bdd04c0c46048ea8892cbc850c877d54ba850b6
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious or known malicious domains, indicating a link farm or phishing attempt. The heuristic firings confirm the presence of malicious redirector links and a link farm, with one URL specifically flagged as malicious. The ML classifier also strongly indicated maliciousness.

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 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://crophysi.ru/strik?utm_term=hindi+nursery+rhymes+lyrics+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4416919/normal_5ffcce8e98a90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367624/normal_600361446894a.pdfIn PDF document text
    • http://damvglaz6.xyz/713635308931o7vv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451350/normal_5fe03545b585f.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/rinixozukomesekimizi.pdfIn PDF document text
    • https://cdn.sqhk.co/waxolulum/ggdlnHb/100_hitz_radio_online_free_online.pdfIn PDF document text
    • http://nat-yoga.space/lujifaritibumobufasijovezwb8vl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419857/normal_5fd9bb507ceb6.pdfIn PDF document text
    • http://nukadaz.iblogger.org/wipiximote.pdfIn PDF document text
    • https://cdn.sqhk.co/savaketiju/jd2ggjb/ddpai_mini_car_dash_camera_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476766/normal_5fc7993dbcda8.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/8vifbwC/live_stream_debate_tonight_fox_news.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/hiieihd/world_rowing_u23_championships_sarasota.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://zulexesovo.epizy.com/plague_inc_vampire_guide_normal.pdfIn PDF document text
    • http://zelixedamaxux.rf.gd/sowixi.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_off0000cd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD55 5248 bytes
SHA-256: dbd2fbe00a3d29681ecfb957841e13fde8882f3762601b8f0160134b99f85b39
font_01_sfnt_off0000df10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 10976 bytes
SHA-256: 9c5eb5d384efb70a93baccd5450894baa3406e4db6244082a0e75394bcb8bc6a
font_02_sfnt_off000103ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AE 8956 bytes
SHA-256: 4edc2c738b42c5b6218c8d0122fca8ca1e44bc53abdf7c04e2e2b0e06c0d3cd7

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