Malicious PDF — malware analysis report

Static analysis result for SHA-256 8036dcead89fc22b…

MALICIOUS

PDF

83.7 KB Created: 2021-05-27 18:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ba35bc709833e106398dc5aef87bf010 SHA-1: 87041878d57810dab34a1a6f11686a2171f10ec3 SHA-256: 8036dcead89fc22bbd0a18d93d346296932139ebb03fe5ee3704ff3174d2112c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=melhores+sistemas+de+ensino+do+brasil+2019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421218/normal_5fedc6fd72625.pdfIn PDF document text
    • https://vimugowome.weebly.com/uploads/1/3/4/3/134323071/241262.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450636/normal_5fe52f97e5d6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481820/normal_602c84a6506a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372355/normal_5fe7704386ced.pdfIn PDF document text
    • https://kipunelikerave.weebly.com/uploads/1/3/0/9/130969086/gofaj_soxidogexeri_joxug_xopukanarafelaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489255/normal_6022496ed3cc0.pdfIn PDF document text
    • https://gujuwazadux.weebly.com/uploads/1/3/2/3/132303410/vapejorizepine-bixuvesekatel-badijesasekitot-rogef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470405/normal_604ce3961bf9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450148/normal_6057c6185f4ec.pdfIn PDF document text
    • https://patajarixeli.weebly.com/uploads/1/3/1/0/131070073/komuminives.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456166/normal_5fff3a4cdf93b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_60412a374ca7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424696/normal_5fdd65e36c5b6.pdfIn PDF document text
    • https://dirifulezidume.weebly.com/uploads/1/3/2/7/132740871/mifofokusuvalasupura.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422371/normal_5ff017c30dba4.pdfIn PDF document text
    • https://pefobasor.weebly.com/uploads/1/3/4/1/134131397/kipidibasap-folejijulijo-gitaguri-pipuje.pdfIn PDF document text
    • https://dotofufodil.weebly.com/uploads/1/3/5/3/135313806/bawidukurefezu.pdfIn PDF document text
    • https://beginuvemosuso.weebly.com/uploads/1/3/4/6/134699988/6742796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490138/normal_605a663a3bc2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369907/normal_5ff3eeead92e2.pdfIn PDF document text
    • https://rasuzumiketasak.weebly.com/uploads/1/3/4/3/134393825/3517052.pdfIn PDF document text
    • https://muzobigen.weebly.com/uploads/1/3/4/3/134310091/rakenaki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465010/normal_5feb946e74b08.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 5692 bytes
SHA-256: eb5a0e8fb6c26393260343083cdb67b00ba0887d27c700e7cf5509ecfad50997
font_01_sfnt_off00011662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11662 13472 bytes
SHA-256: 73b7c36549d07a6721fbc9c26ae5f3134382cec712c8297018a8b8b172bbd025

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