Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19eee1645575a31…

MALICIOUS

PDF

70.4 KB Created: 2021-02-10 02:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3ab59d002e3ef4ea10b8b47bccd2f8a8 SHA-1: 5c466e3a0b6488c9c63f4e58daf6c609d3ba6764 SHA-256: a19eee1645575a311f7ab74fbbcea997132fa1ed0046b413f98be90ec6d0e017
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic suggest the document's primary purpose is to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=apk.mob.org+gta+vice+city In PDF document text
    • http://kapusta.pro/41274998462gezgv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481675/normal_5fd657a90a1de.pdfIn PDF document text
    • https://memezuwiz.weebly.com/uploads/1/3/4/7/134702577/vudopepa.pdfIn PDF document text
    • http://wukosuwusa.iblogger.org/allstate_medical_claim_forms.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/25f05.pdfIn PDF document text
    • https://dubobovutorikug.weebly.com/uploads/1/3/5/3/135332124/c3198fdd009.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449187/normal_5fff16eb9acad.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/gosete/dls_cheat_koin.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/20021910369.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/run_itunes_on_android_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/ananda_bhairavi_songs_free_doregama.pdfIn PDF document text
    • http://bosadubarelazu.rf.gd/allianz_sigorta_bes_iptal_formu.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/ethiopian_reporter_amharic_news_letter.pdfIn PDF document text
    • http://fizoluzakazuxaw.rf.gd/lerolonel.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_off0000d438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD438 5428 bytes
SHA-256: c7cba3e6d4a205cb04876cc06ebc014e59ea1516d59414149e7cab1a9d60c848
font_01_sfnt_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 10736 bytes
SHA-256: c7e7684c732456673274170d938c184ff0d24817bf5ed1ee5ee1ee329ca12b61

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