Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9601f073e623b6…

MALICIOUS

PDF

83.7 KB Created: 2021-02-17 05:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5a84271d210b0eca751320cb3dd8fb42 SHA-1: d1a6d0813a325ff44c6b2b787284ce3f63440a00 SHA-256: 1f9601f073e623b60bc706d2d2acaf841ae2f19fc66108f089dc4c5cbd0a48da
214 Risk Score

Malware Insights

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

The file is a PDF containing a large number of embedded links, identified as a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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://yafferge.ru/aws?utm_term=how+to+clean+brush+head+on+dyson In PDF document text
    • https://bematurom.weebly.com/uploads/1/3/4/8/134886193/7228012.pdfIn PDF document text
    • http://jalatuxu.iblogger.org/commutative_property_multiplication_worksheet.pdfIn PDF document text
    • https://faruroju.weebly.com/uploads/1/3/5/9/135986438/gofeselasodokin.pdfIn PDF document text
    • http://zazubabifuwor.iblogger.org/21952625282.pdfIn PDF document text
    • http://tefituguj.iblogger.org/zojibumanebojub.pdfIn PDF document text
    • http://easycreditscore.info/991266580526cj5q.pdfIn PDF document text
    • https://witaretazijaw.weebly.com/uploads/1/3/0/8/130813730/c6f0220ee4ea57.pdfIn PDF document text
    • http://nebibila.iblogger.org/high_voltage_transformer_design.pdfIn PDF document text
    • http://driveformclanemilwaukee.com/114955439704gh4e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/didevamidevujatolexesi.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/avg_antivirus_pro_cracked_apk.pdfIn PDF document text
    • http://tibilekozox.epizy.com/mirerorovimerewugal.pdfIn PDF document text
    • http://woxanegerofokox.rf.gd/sejutonetigodaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/sound_app_for_android_phone_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/51305140720.pdfIn PDF document text
    • http://waxodomopupu.epizy.com/free_guitar_chords_app_for_android.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_off00010a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 5324 bytes
SHA-256: 916b82dd79f6b4fb8c3e25ed6b34ca787266878bead5f6ffc65df8ba501a7f48
font_01_sfnt_off00011c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C22 10900 bytes
SHA-256: 6e5dc6c89126af322a046e922c3f047d9ed4cf6e6aadcb8b1104c2962e15c02e

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