Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1480f4130b79968…

MALICIOUS

PDF

78.1 KB Created: 2021-04-20 06:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7d894c964a44378a9346216fb29f2175 SHA-1: 594a4e8f324b25046e8b1f86e9f2881738169495 SHA-256: a1480f4130b79968d4d1c0a133704c2a1472dc072d68348e5027a4843a32ea4c
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 0.9998

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://bologen.ru/strik?utm_term=really+good+aa+topics PDF link annotation
    • https://mivijupa.weebly.com/uploads/1/3/4/5/134578330/1283631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392209/normal_6058b310d4ee1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467589/normal_600a8be3e9c27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465249/normal_5fc5f18cd6b4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489244/normal_6060cac6224c0.pdfIn PDF document text
    • https://risimapi.weebly.com/uploads/1/3/4/3/134321435/bekepejesor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447108/normal_602a2a2a90222.pdfIn PDF document text
    • http://wusapibixabupak.iblogger.org/construct_2_games_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lafotesawopabo.epizy.com/53199854222.pdfIn PDF document text
    • http://wobemiko.epizy.com/54036772958.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/37406898315.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/85457947171.pdfIn PDF document text
    • http://mawovewukebiz.rf.gd/siwewufu.pdfIn PDF document text
    • http://xepadegi.epizy.com/93329590374.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/kudalu.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/77835236492.pdfIn PDF document text
    • http://fijazatomowov.epizy.com/arabic_alphabet_and_numbers.pdfIn PDF document text
    • http://jawikaginixuxuz.rf.gd/corbettmaths_expanding_three_brackets_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/potupaxinitunum.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/dash_dec012aq_deluxe_rapid_egg_cooker_manual.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_off0000f2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D3 5256 bytes
SHA-256: 3c5025849240d2f2df86c974286ad0a7131de7528a49de69bfff8354a1e31419
font_01_sfnt_off000104dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 11400 bytes
SHA-256: a7879e37b57709fd0d20426a77739ebbcc49cf9fa35638fbdae1fb713edcdaa9

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