Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbef0d1d7f5f1f77…

MALICIOUS

PDF

64.8 KB Created: 2021-03-15 20:54:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e9bed7360630320296243c5a5b955d89 SHA-1: a5167f7635271a8d23d0949e17a034b0e62193d3 SHA-256: dbef0d1d7f5f1f77dec5dbd7704a009233196f2119ae3f2b4bced557a7bb7466
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The primary URL, 'https://xezojetit.ru/award?keyword=pdf+econometrics+for+dummies', suggests a lure related to academic or technical documents. ClamAV and ML heuristics also flagged this PDF as malicious, specifically as a phishing or trojan variant.

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://xezojetit.ru/award?keyword=pdf+econometrics+for+dummies PDF link annotation
    • http://bomaduworofa.medianewsonline.com/47938784853.pdfIn PDF document text
    • http://waliduv.mypressonline.com/elements_of_acoustical_engineering_olson.pdfIn PDF document text
    • http://znalomstvavip.site/historical_events_1900_to_1920dn4tj.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/noxegaka-tanosiwawoju.pdfIn PDF document text
    • http://trycabinets.xyz/42820923134wzzbp.pdfIn PDF document text
    • https://lamosafobe.weebly.com/uploads/1/3/5/3/135322951/dojifom.pdfIn PDF document text
    • http://tesekal.mygamesonline.org/89405335268.pdfIn PDF document text
    • https://dipojujepu.weebly.com/uploads/1/3/4/5/134526160/8015524.pdfIn PDF document text
    • https://kimodoximotoden.weebly.com/uploads/1/3/1/8/131856266/rizadagobujovivije.pdfIn PDF document text
    • https://fefejixoloxit.weebly.com/uploads/1/3/0/9/130969032/sefikalefi_nutunato_kebixemoxevaxi.pdfIn PDF document text
    • https://zememaxuzibur.weebly.com/uploads/1/3/5/3/135326459/tevixuvi_nupamoje.pdfIn PDF document text
    • https://zugivosiruboni.weebly.com/uploads/1/3/1/8/131858419/xitojexirilujot.pdfIn PDF document text
    • http://zotoxilob.getenjoyment.net/kepimogafiwogaruf.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/starting_point_andy_stanley_season_24.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/fajonubinomeder/93569572259.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/macedonia_tourism_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/57910310597.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/kakotedudoriwafu.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/jotaxutagopexuboru.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/fituliworesi.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/zumuwojitagejuwok.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_off0000c395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC395 4928 bytes
SHA-256: c9ea5243d7cc75c601f87a8e5297a3aae70c89598da6738c6a7db0f90a2cc613
font_01_sfnt_off0000d446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD446 9960 bytes
SHA-256: b9221e3adb92049d3fa6db0f624443a66e811294436e524ef3f44f3a2b07edd0

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