Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90719f9a01c5143…

MALICIOUS

PDF

74.8 KB Created: 2021-03-28 00:08:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a4ce597ab60eabcedb8670bfce3ed2d SHA-1: 76d2cb883e232fd902e267e17c9ea06d5ba2ab25 SHA-256: d90719f9a01c51431a11bf86acdc446ec3f036ac6fdb8c106e1aa1f242a39c74
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external links, with one pointing to a suspicious URL ('https://pelibifir.ru/123?utm_term=brave+mod+apk'), suggesting a phishing or malware distribution attempt. The PDF structure and embedded content indicate it's likely part of a link farm or SEO poisoning scheme to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/123?utm_term=brave+mod+apk
    • https://mefimume.weebly.com/uploads/1/3/1/4/131437875/zavozobarav.pdf
    • http://sixesijilolun.mywebcommunity.org/polk_audio_magnifi_mini_sound_bar__wireless_subwoofer_review.pdf
    • http://vojemodipu.sportsontheweb.net/garmin_2689lmt_battery.pdf
    • https://zofoneparadi.weebly.com/uploads/1/3/5/3/135341866/rotoperutakiwakire.pdf
    • https://tamilavijunaw.weebly.com/uploads/1/3/4/5/134506647/1123887.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jezekemunidup/46293580523.pdf
    • http://lonesopuw.onlinewebshop.net/printable_kindergarten_math_worksheets.pdf
    • https://s3.amazonaws.com/ginutu/letterhead_header_template.pdf
    • http://bogetezapore.rf.gd/que_frutas_se_puede_comer_con_piedras_en_la_vesicula.pdf
    • http://melumudinev.epizy.com/19976281781.pdf
    • https://s3.amazonaws.com/savukojubusum/nice_guidelines_for_neonatal_jaundice.pdf
    • https://s3.amazonaws.com/rakabexozu/dakosedate.pdf
    • https://s3.amazonaws.com/dazinibonofobi/final_fantasy_14_shadowbringers_dragoon_guide.pdf
    • https://40c507a3-37b7-491f-afd3-f28ba3af1fb2.filesusr.com/ugd/7f5264_c2047cdb200e4c3fb29dbb4753a27749.pdf?index=true
    • https://s3.amazonaws.com/vososasoxumete/32771138681.pdf
    • http://kejijisutova.epizy.com/wosipogofikuxu.pdf
    • https://s3.amazonaws.com/dusubonifu/three_laws_of_motion_worksheet.pdf
    • https://s3.amazonaws.com/zidenigad/66057629921.pdf
    • https://s3.amazonaws.com/rujimidujek/guitar_chords_book.pdf
    • https://s3.amazonaws.com/sesafefanulokam/how_to_reset_a_linksys_wifi_extender_re7000.pdf
    • http://boboxivelo.epizy.com/how_often_should_i_replace_my_shark_vacuum_filter.pdf
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_72ad9a0d391d4ec9aee6e25bb45b581b.pdf?index=true
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_a5848ea41c42496d86aa6dd1a3e4103c.pdf?index=true
    • 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_off0000e4ae.bin
259e322e65f87a5abf8b9c5ba6778336ed6a56702198228e8b20383bfaa7f300		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AE 5068 bytes
font_01_sfnt_off0000f5df.bin
9efeba370ec233b15c54b3966a826a41615cb36e8a928767c553689b88fdab57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 12468 bytes

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