Malicious PDF — malware analysis report

Static analysis result for SHA-256 194d761a229a1125…

MALICIOUS

PDF

64.1 KB Created: 2021-02-26 20:55:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c7994fbeec7899110b21701421febb18 SHA-1: 8d5ccdbca1831459e556004a4d66d280ed13ed7a SHA-256: 194d761a229a11257a5f8f2d0a5ff7b896b8fb7a2c269d44bf08a3e5f6e6c8a6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic firing indicating a link farm. One prominent URL, 'https://zajinet.ru/wb?keyword=technical%20support%20executive%20interview%20questions%20and%20answers%20pdf', suggests a lure related to technical support job interviews. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to further malicious content.

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://zajinet.ru/wb?keyword=technical%20support%20executive%20interview%20questions%20and%20answers%20pdf PDF link annotation
    • https://tofibuji.weebly.com/uploads/1/3/5/3/135309424/9777014.pdfIn PDF document text
    • http://persequen.com/me_earl_and_the_dying_girl_full_movie_online7botb.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/dzjhNOX/76013026861.pdfIn PDF document text
    • http://babysampler.com/nemovimomiligasixebiwenodu1.pdfIn PDF document text
    • https://cdn.sqhk.co/widagawinud/hd0ihje/mx_player_hd_video_apk_download.pdfIn PDF document text
    • http://begdas.space/tekawitifixamxg90i.pdfIn PDF document text
    • http://avbox.org/warcraft_ii_tides_of_darknessgqqu1.pdfIn PDF document text
    • https://mitosimizede.weebly.com/uploads/1/3/4/3/134372473/802eab80fe.pdfIn PDF document text
    • https://rosajojuzexoked.weebly.com/uploads/1/3/0/8/130874599/duxeb_diraw_sajijukufivagev.pdfIn PDF document text
    • https://cdn.sqhk.co/tudenireso/pXFhejj/bike_racing_2_unblocked.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/dusubonifu/ryanair_app_boarding_pass.pdfIn PDF document text
    • http://zamonile.epizy.com/african_dance_moves_video.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/check_self_permission_android_fragment.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/77754365772.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/togefuzatimesijubi.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_off0000c1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AE 5536 bytes
SHA-256: f8be07bae8bbe7793ae0f946789a421ab47c87b6d33c15bc1ae21d5d52487464
font_01_sfnt_off0000d48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48F 8976 bytes
SHA-256: 0fc10955ef03fef88bf798e94917be312901281314dda2c595928cc4bbba7696

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