Malicious PDF — malware analysis report

Static analysis result for SHA-256 915d3f7445a1b986…

MALICIOUS

PDF

73.9 KB Created: 2021-03-08 18:11:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6be8181f84d4157678a13895ae927193 SHA-1: 830cbe3abd1a6fff6f1aed3f620b7f82d1143533 SHA-256: 915d3f7445a1b986601fa6688cf372bbec282d9038ad88b36c52538b251cae22
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 are SEO-themed and point to potentially malicious domains. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. The embedded URLs suggest the document is designed to redirect users to malicious sites for further exploitation.

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://zajinet.ru/strik?utm_term=ph+diagram+of+refrigeration+cycle+pdf PDF link annotation
    • https://cdn.sqhk.co/wagavoketi/Uadiv95/crossword_puzzle_answer_for_freeloader.pdfIn PDF document text
    • https://cdn.sqhk.co/gazegarov/Z842Yii/pizonexowuxa.pdfIn PDF document text
    • https://cdn.sqhk.co/pememobuwir/iXDXeQg/leap_of_faith_water_slide_slow_motion.pdfIn PDF document text
    • https://cdn.sqhk.co/zolilobup/jhc9hgL/banana_cake_easy_recipe_without_oven.pdfIn PDF document text
    • https://ridixuzo.weebly.com/uploads/1/3/4/6/134605053/juledupul-muroz.pdfIn PDF document text
    • https://cdn.sqhk.co/vekokizijam/piiTigb/86405389595.pdfIn PDF document text
    • https://cdn.sqhk.co/pimepojuti/iigfgcK/hard_boiled_crime_fiction_movies.pdfIn PDF document text
    • https://cdn.sqhk.co/reruzemafow/6xCSgcd/58153485615.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonotiso/geVsjfs/74392680586.pdfIn PDF document text
    • https://kimilirakafame.weebly.com/uploads/1/3/4/6/134659192/zironetosositikod.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/feseni/sccm_1906_upgrade_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/capture_one_pro_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/arsenal_vs_man_utd_highlights_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/bharat_movie_video_songs_tinyjuke.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/zenowigunuperalekaru.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/makitamikutejafoz.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/dell_b1160w_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/zutuluzokofaful.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/46039670401.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/gnomonic_chart.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_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 5492 bytes
SHA-256: 7223e470afa355542706f16982c100e81d35af24bbfdcc8e356e8e1f8fb8aeb9
font_01_sfnt_off0000f5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CA 10560 bytes
SHA-256: 76c52b01d48a16add6bdb335e67157a7893bccbe7b0ce0b69d683fc3140e3222

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