Malicious PDF — malware analysis report

Static analysis result for SHA-256 6105b4c070718de6…

MALICIOUS

PDF

77.6 KB Created: 2021-05-21 03:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1245b5bcd30675702f12dde02fdb5719 SHA-1: 29ce1725565232cbccf9ba47cd401eb0d3ae2da1 SHA-256: 6105b4c070718de6421255033b3c7bd7a26bf47c1358a9f7a3ccd085cf4e990c
96 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious. It contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely used for phishing. The PDF structure also shows signs of manipulation with duplicate object bodies, indicating an attempt to evade detection. The presence of embedded URLs and the overall detection by ClamAV strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://vilenefex.ru/strik?utm_term=mario+kart+tour+multiplayer+friends+reddit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446773/normal_6058470b9951f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417528/normal_605a1ac38b2ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489263/normal_60486e6f75185.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460946/normal_6007206c7d0e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490725/normal_605bc4ccd702a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446511/normal_603197f0cfc4a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/49129c0f-3d87-47b0-ad4e-f69bb3f58f25/how_i_became_a_pirate_by_melinda_long.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/56797566889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8430d7e6-393a-4fe6-bd65-0f1f2297abed/sony_ps-lx300usb_needle_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb070112-971a-4c5a-a0da-9c8a0a76061d/safety_dance_glee_concert.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/remetis.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/calendar_2020_malaysia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/586654c5-8d1e-4027-ac9f-fb5e4639f9bd/58555066239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be0b14b-e1e6-422e-9846-05efbbc30551/youtube_audio_libro_la_divina_comedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4027709f-39ef-4bcd-b0dd-23222d522bf3/beginner_piano_sheet_music_with_letters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80f7285f-ec7d-4fd4-a668-c9058d11872c/rebedobazusadugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcc74288-a928-4104-90cf-5d5fbcca8fd7/zumo_660_motorcycle_mount_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdbd6c7a-0966-41cc-90ea-522762e7ac3f/ramelukudufirapul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc9d405a-338c-470e-b3b4-f2cf52fe815c/dr_seuss_bartholomew_and_the_oobleck_read_aloud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da59354f-1e66-4a8c-9747-f36def80f3e3/dotakab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2feec51a-4f10-438b-ba36-2bc00fac5763/shashi_tharoor_-_inglorious_empire_what_the_british_did_to_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/282a3383-2a53-4ced-9e46-f2b6105adc03/43711136801.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/factors_affecting_boiler_efficiency.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/what_does_aa_meeting_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6a7c417-d27a-4629-9c9c-f5b6ee918768/tefijomutejuzoda.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_off0000f030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 5360 bytes
SHA-256: cddc7e12eb024a16ee7d899fe037940ade322bf85162b07afa32a374a8fea31d
font_01_sfnt_off00010271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10271 11352 bytes
SHA-256: d506b07a74da8356425649873e2ceec31b923f512b14b5a259a07bc7cb7e2f3f

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