Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f573011b4f7424…

MALICIOUS

PDF

126.2 KB Created: 2021-02-27 04:58:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9a336c66880fb2133db331a6678440d3 SHA-1: 5a000fc59fcc3d4c8059036c516681405b0f2ee4 SHA-256: c3f573011b4f74249df767eef9b1be2b9f97f7fae77162fd94e43a5133e8dedc
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of the primary URLs, https://maypoin.ru/wix?keyword=emission+of+energy+electron, is suspicious and likely part of a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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
  • 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/wix?keyword=emission+of+energy+electron PDF link annotation
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/ca2ffd76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465397/normal_602258b23e231.pdfIn PDF document text
    • https://silodadut.weebly.com/uploads/1/3/2/7/132712229/buxedidinexujox.pdfIn PDF document text
    • https://xijegasafofid.weebly.com/uploads/1/3/0/8/130815381/wugemepojo.pdfIn PDF document text
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/3c833b20f9.pdfIn PDF document text
    • http://giocodigital.website/87158473621dbn3x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366655/normal_600657aebca12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366309/normal_5fe18fdf1b53f.pdfIn PDF document text
    • http://grenkasalo4.xyz/dawalazobobaso4qxw5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387410/normal_5ff6beb11ca76.pdfIn PDF document text
    • http://autocredit.moscow/surah_al_kahf_in_englishrp6gb.pdfIn PDF document text
    • http://wowitaly.pro/jovobomekilaxezuvijofipesotvv6.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/tesotiwapax/byrsonima_crassifolia.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/kizonulisokemajepa.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/romemujefujuvibavogutapu.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/potivipudepuko.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/gavebogutusog.pdfIn PDF document text
    • http://wobanunep.myartsonline.com/ligog.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_off0001b3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3A4 5052 bytes
SHA-256: 48da6a71440f8c5800c57f40425bd57479cf84f43afdb1ff9824b200e9905b9e
font_01_sfnt_off0001c4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4D2 11272 bytes
SHA-256: 3be0a7d67e83b95d0b3dc9af59ef8516fbae9d84dc5d83faed9637f9f463f98a

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