Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9f099c4bf82132…

MALICIOUS

PDF

76.6 KB Created: 2021-03-17 22:22:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6816d38181c65f3689ff400731d128f1 SHA-1: d0716cfea257d02d76ce64e1d9c6069a4f638f7f SHA-256: af9f099c4bf821324776c34d49f8c35083cac6a4e530bfbfabaae5358c566d18
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various websites. One such URL is https://resalured.ru/123?utm_term=arjun+reddy+photos++please. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classifying it as Pdf.Phishing.Trojan. The presence of embedded URLs and the link farm suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/123?utm_term=arjun+reddy+photos++please
    • https://sewogasi.weebly.com/uploads/1/3/1/1/131163712/wosilasuzubawo-dezusimuruxujuz-valoloxenimur-riruvutu.pdf
    • https://cdn-cms.f-static.net/uploads/4450631/normal_6026c18c2a9b4.pdf
    • http://feviziwomuta.iblogger.org/hematology_analyzer_service_manual.pdf
    • https://mobefoba.weebly.com/uploads/1/3/0/7/130776725/junameturinal.pdf
    • https://static.s123-cdn-static.com/uploads/4427506/normal_5fcbe031db3a8.pdf
    • https://cdn.sqhk.co/zirigajer/jaYgjjb/42025585646.pdf
    • https://cdn.sqhk.co/rebabafa/jhgcqcT/moto_bike_racing_super_rider_game_download.pdf
    • https://xosulokut.weebly.com/uploads/1/3/4/4/134466674/5c59d50fa4c1.pdf
    • https://static.s123-cdn-static.com/uploads/4418013/normal_5fe5f6b66177f.pdf
    • https://nuwukovodikala.weebly.com/uploads/1/3/4/6/134666266/c8eefe4.pdf
    • https://cdn.sqhk.co/tizarina/vhjhdii/fogoxujofe.pdf
    • https://cdn.sqhk.co/tivinarafuvu/gjWQhbO/bixasatazinu.pdf
    • http://naturfresh.fun/25839883603z7a0.pdf
    • https://cdn.sqhk.co/wofazexej/cgiZQ8N/xulanufuledadiw.pdf
    • https://static.s123-cdn-static.com/uploads/4385631/normal_5ff105516f58d.pdf
    • https://cdn.sqhk.co/zopimoforaja/ijeZibr/xbox_360_wireless_headset_battery_replacement.pdf
    • https://cdn.sqhk.co/zurefaxenov/Xpjatjb/24923924110.pdf
    • https://momugidofene.weebly.com/uploads/1/3/4/2/134235368/b15677b28.pdf
    • http://matcobzor.ru/matricom_g-box_q2_firmware_2.2.10ltof6.pdf
    • http://mif-smeh.space/how_to_write_a_self_evaluation_essay_for_workzc0ju.pdf
    • https://cdn.sqhk.co/ravuviwidi/jdhhigf/74072209683.pdf
    • https://cdn-cms.f-static.net/uploads/4387037/normal_600f45d98f1fb.pdf
    • https://cdn.sqhk.co/tuzevawu/iahbjdL/tirokirobanakijidike.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xituduriximujat.epizy.com/zerabowiwafilut.pdf
    • http://fedasumenusum.rf.gd/9717377582.pdf
    • http://puxabilaxomim.rf.gd/intl_business_machines_corp_stock_price.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb0.bin
58c5f9a710e87eb228e0b8d5b2613734f41b2a641400f156c42f61e60ebafb03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 5212 bytes
font_01_sfnt_off00010071.bin
988e80549ad80a04194e8995340cc7c6bbb5b1ead6e66c4a99a94244ef10beae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10071 10668 bytes

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