Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae663445a3b951a4…

MALICIOUS

PDF

92.3 KB Created: 2021-03-16 23:02:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: d937545ed6126d972212612726625a35 SHA-1: b4b0551e3899802879f8a0309e8d3d71f83b1086 SHA-256: ae663445a3b951a48624a38e20a62f94b29acbc176cd85f46d95b682c2d859fa
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which are SEO-optimized and point to PDF files, suggesting a link farm or phishing attempt. The primary external URI, 'https://midufefew.ru/wix?keyword=computer+security+principles+and+practice+4th+edition+solutions+pdf', is presented as a search result for a book, likely a lure to encourage clicks. No scripts were extracted, but the PDF structure and numerous external links indicate a phishing or malicious redirection attempt.

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://midufefew.ru/wix?keyword=computer+security+principles+and+practice+4th+edition+solutions+pdf PDF link annotation
    • https://xawizavikerid.weebly.com/uploads/1/3/4/5/134525990/2652045.pdfIn PDF document text
    • https://gifiboluf.weebly.com/uploads/1/3/2/6/132681188/d3870dfe26.pdfIn PDF document text
    • https://dijekoko.weebly.com/uploads/1/3/5/3/135315120/1599554.pdfIn PDF document text
    • https://lopepuru.weebly.com/uploads/1/3/4/3/134320072/rovum.pdfIn PDF document text
    • https://jojeditisiteso.weebly.com/uploads/1/3/1/6/131606373/0c419a172fa56a2.pdfIn PDF document text
    • https://gilurumujeluzem.weebly.com/uploads/1/3/1/8/131857598/rarawebasovikuk.pdfIn PDF document text
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/7049136.pdfIn PDF document text
    • https://dudobafileziv.weebly.com/uploads/1/3/5/3/135331993/a85c41.pdfIn PDF document text
    • https://matiposokatogu.weebly.com/uploads/1/3/0/7/130739068/rapujuta_komix_gujuwenedimoga.pdfIn PDF document text
    • https://zavomejuguz.weebly.com/uploads/1/3/1/1/131163615/b799f.pdfIn PDF document text
    • https://nebijuwako.weebly.com/uploads/1/3/4/3/134376342/6873340.pdfIn PDF document text
    • https://lemapemoj.weebly.com/uploads/1/3/4/0/134040436/dafunurobitonokap.pdfIn PDF document text
    • https://kupafejesuxab.weebly.com/uploads/1/3/4/6/134650707/gozuzawo.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/viwoxuz/45247089782.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/free_father_christmas_reply_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/tumelifin.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/frontline_commando_2_mod_apk_unlimited_everything.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/48075930787.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/98589166232.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/whatsapp_funny_video_kannada.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_off000128fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FC 5488 bytes
SHA-256: b3e06a06fafc9cff18957d19c9a6ef2246935bfb20d1de504f1a0bb617bfbb0a
font_01_sfnt_off00013b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B86 11856 bytes
SHA-256: 453bd0b8891eeb85a43d5293bf33b33885f1371350268a6644ae23aa6477fbf3

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