Malicious PDF — malware analysis report

Static analysis result for SHA-256 b073a2ff4c73bc80…

MALICIOUS

PDF

71.5 KB Created: 2021-02-18 12:00:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3c3611ad4d1080a81534fad45e476fab SHA-1: c8edd9fce7a1106064d4c244870936fba55e8776 SHA-256: b073a2ff4c73bc80094f9c0826e2124379729788bdbd2188fb18333e05516e0a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic identifying it as a link farm. Several URLs point to potentially malicious domains, and ClamAV detected it as Pdf.Phishing.Trojan. The presence of embedded URLs and the ML classifier's high confidence further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's used to redirect users to malicious content.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://maypoin.ru/strik?utm_term=is+jkd+effective+in+a+street+fight PDF link annotation
    • https://porovepo.weebly.com/uploads/1/3/4/5/134527374/bapijezojetiv.pdfIn PDF document text
    • http://bit7.top/turbochef_oven_spare_partsmzadh.pdfIn PDF document text
    • http://2220202.ru/dopokezegepukapiretreko5.pdfIn PDF document text
    • http://persequen.com/487602497246ud7l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sejofedavija.epizy.com/kuxega.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/asphalt_xtreme_android_1_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/80789738323.pdfIn PDF document text
    • http://vavijiguzedimeg.epizy.com/past_perfect_affirmative_form_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/58673998223.pdfIn PDF document text
    • http://nasobozavas.epizy.com/wallpaper_bunga_tulip_putih.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/ffxiv_fishing_leveling_guide_70-_80.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/oneplus_6_android_10_gcam.pdfIn PDF document text
    • http://witopovuketoj.epizy.com/pigetidamusamalorunave.pdfIn PDF document text
    • http://revuzulikasulo.epizy.com/rogers_anyplace_tv_apk.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_off0000dc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC77 5388 bytes
SHA-256: 3be33e4f6a08e7d7d52e98c6738c0da84d490a255f43b7d1116d58e39c037ef6
font_01_sfnt_off0000eed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED8 10132 bytes
SHA-256: ed96e4d74a5be51126b2f9871bb06f9896d14fff761682b4834964218a257eea

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