Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34d714a7c5cccb5…

MALICIOUS

PDF

77.1 KB Created: 2021-05-03 12:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26019d58e3ae69cdf0fd26908a891f72 SHA-1: 51a22caeab6cad77d3f87e1763648e56393cd125 SHA-256: b34d714a7c5cccb549135912646346d5c4121db3254e9547ee02496ebb786759
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to a 'Brita water bottle user guide'. No scripts were extracted, but the presence of an external URI and the overall detection suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=brita+water+bottle+user+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/28341a25-3535-4b7b-b3ea-339e2a4b8662/summer_baby_monitor_no_signal_message.pdf
    • https://uploads.strikinglycdn.com/files/cfa3f4e9-d0a1-4519-9bf6-f0e69a087b66/4908179836.pdf
    • https://uploads.strikinglycdn.com/files/425cfbdb-9195-4bea-90ab-fdf7d9d9702f/gotusujanodebunetafuluva.pdf
    • https://uploads.strikinglycdn.com/files/c54967f3-0230-40da-8861-678329dde128/lerikidaxidibowuk.pdf
    • https://s3.amazonaws.com/levumoduf/renidifux.pdf
    • https://uploads.strikinglycdn.com/files/892ef9c8-8d52-4bb7-b7e0-feb9fe14511e/luwurejuzewixafi.pdf
    • https://uploads.strikinglycdn.com/files/4a0341be-b78d-4771-903d-15e721f90914/68565626478.pdf
    • https://uploads.strikinglycdn.com/files/9297aaa0-0dc4-4faf-88ab-f510c8ffb151/what_is_the_lexile_of_crime_and_punishment.pdf
    • https://uploads.strikinglycdn.com/files/64a07317-b37f-4ea3-a1c8-8b17c16e5726/wawovitevokevu.pdf
    • https://uploads.strikinglycdn.com/files/3f17ecea-b381-4e15-b0a8-11aea0348f42/xizetadizoxa.pdf
    • https://s3.amazonaws.com/fosalizuzu/59971484179.pdf
    • https://uploads.strikinglycdn.com/files/fb5884c0-5362-49c3-b57f-39370c2c8c02/how_many_calories_in_a_fried_potato_taco.pdf
    • https://s3.amazonaws.com/tikoweravisixu/tapadufagojusozokowuridi.pdf
    • https://uploads.strikinglycdn.com/files/d3c126b4-d4db-4ad9-af6b-a218d82286ed/simple_human_soap_dispenser_user_manual.pdf
    • https://s3.amazonaws.com/jupevuxirapi/catia_v6_tutorial_free_download.pdf
    • https://s3.amazonaws.com/xukanomarexumu/ipcc_5th_assessment_report_gwp.pdf
    • https://uploads.strikinglycdn.com/files/2ea3645c-5004-440b-b080-ed0a9b586793/77105406223.pdf
    • https://uploads.strikinglycdn.com/files/77edb565-3de8-485f-8e89-2655a46b634a/45826331252.pdf
    • https://s3.amazonaws.com/dazuxujepov/photoshop_for_windows_7_full_version.pdf
    • https://uploads.strikinglycdn.com/files/f94608c6-3a10-427a-88fa-14aa037e08bf/29109013556.pdf
    • https://s3.amazonaws.com/pozokimepe/23152261566.pdf
    • https://uploads.strikinglycdn.com/files/194a948f-a3d7-4b31-b966-177c0848276f/jisirugopi.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_off0000efaf.bin
5c76698cb359e217511954b9285aeefdb09d49583f6d14a2b8a13066c83a2c8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 5276 bytes
font_01_sfnt_off000101b8.bin
58cdba7137fc081d8a690ad50e4a02810f747742d5037af7b4d1a169e2b45f45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 11008 bytes

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