Malicious PDF — malware analysis report

Static analysis result for SHA-256 34dc72f23ba61da8…

MALICIOUS

PDF

74.9 KB Created: 2021-03-06 05:07:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 032bdbb6e86953a154f7985cf6f20714 SHA-1: fc292557303a8ab77b9e76e6089774647d19dbe5 SHA-256: 34dc72f23ba61da8cba205675698eeefdb5258b8c7047088a1807f40dedf11e0
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting a link farm or phishing attempt, with the primary URL being 'https://jacksth.ru/aws?utm_term=an+introduction+to+applied+linguistics+second+edition+pdf'. The document body, though heavily obfuscated, contains metadata related to PDF creation and SEO, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/aws?utm_term=an+introduction+to+applied+linguistics+second+edition+pdf PDF link annotation
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/bc6d7efc.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/TPhcQij/xuritabigo.pdfIn PDF document text
    • https://cdn.sqhk.co/sinonari/6Tge3jj/packer_game_live_now.pdfIn PDF document text
    • https://cdn.sqhk.co/zativojor/ihig1bd/burger_king_breakfast_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/jdgh1gj/undertale_amino_pc_download.pdfIn PDF document text
    • https://damemerivojed.weebly.com/uploads/1/3/4/3/134378109/42a0732ce87.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/n11kigy/14429748002.pdfIn PDF document text
    • https://cdn.sqhk.co/pesegozod/jgyhhbP/loud_ringtones_for_iphone_7.pdfIn PDF document text
    • https://pajenugemin.weebly.com/uploads/1/3/4/6/134677616/fojen-jaderifu-mikikojavorok.pdfIn PDF document text
    • https://cdn.sqhk.co/falugojafat/iReghfQ/firipoxawelutosipe.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/JNFhfhc/sixowamufikuwupimuwesu.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/fusopoxipo/who_pays_better_google_or_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/kipejasu.pdfIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_1d0a15ec27f249929a6d068bba7ad882.pdf?index=trueIn PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_57635954cc0940a89cfebc2310375591.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/flamenco_guitar_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/football_prediction_forebet_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/pdf_file_editor_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/97837819492.pdfIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_b1c2d3d1d2044a19825f385e0927602f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/vava_milk_frother_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/tamuzipirifogixo.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/dudib.pdfIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_3b0c30f463ed424cbfe145af8663bb42.pdf?index=trueIn 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_off0000e580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE580 5312 bytes
SHA-256: 3b5985bf95adcbc51bf0352dac2090bd8ddebbeaed37eecc03963d0ab153792b
font_01_sfnt_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 11380 bytes
SHA-256: abbdce37ee457b5c61d1131c43af4787ab435c9d62adc92e29c359a00280cfac

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