Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0106a2275ebc7c…

MALICIOUS

PDF

76.6 KB Created: 2021-03-02 14:42:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: db00b8306365206e0b99819480376e47 SHA-1: 904f2df87eff5af61f4094d24b554e45d5a3355e SHA-256: 7c0106a2275ebc7cd33595f6374cb2f95b4b3c6e5efccad3fce1eb6eca5110fe
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of a link farm designed to mimic search results or document downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=how+to+make+coffee+hamilton+beach+flexbrew PDF link annotation
    • http://vumonivaxozutod.mypressonline.com/iata_dangerous_goods_regulations_2015_free_download.pdfIn PDF document text
    • http://okrasote.info/gikivuph7dk.pdfIn PDF document text
    • https://cdn.sqhk.co/xibumediw/gjccjid/53351134828.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/90451334340.pdfIn PDF document text
    • http://rowaxamapitowej.getenjoyment.net/the_blind_assassin_by_margaret_atwood_summary.pdfIn PDF document text
    • http://prosucre.pro/71052091859r6upu.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/pZjahhc/electronic_musician_magazine_back_issues.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/apc_back_ups_pro_550_review.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/SJSWNhg/unnatural_causes_when_the_bough_breaks.pdfIn PDF document text
    • http://geekcods.com/avid_critical_reading_deep_reading_strategies_for_expository_texts1gyw8.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/NjghiTA/duvofob.pdfIn PDF document text
    • https://supogile.weebly.com/uploads/1/3/1/6/131606666/joxujelowijugew.pdfIn PDF document text
    • http://rocketdocs.us/sijimoxajenulit7dokl.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/megujobemegor/33191584425.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/a4_folded_to_a5_leaflet_word_template.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/sad_breakup_video_status.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/english_grammar_test_with_answers_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/qt_stylesheet_classes.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/ripupewiwin.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/string._format_java_float.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_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 5268 bytes
SHA-256: 624594bb73ad04749ccdccbd8952f3656c0a3203c8ef9dbaddf75a6325dcc879
font_01_sfnt_off000101ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EE 10184 bytes
SHA-256: ad524ec2355df3eaec718305d2e218c393bc552b180b2be50b2ca1c9239c4962

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