Malicious PDF — malware analysis report

Static analysis result for SHA-256 38bb3d3a6a7d7c62…

MALICIOUS

PDF

76.3 KB Created: 2021-03-20 15:55:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 189d599832a4e44572b23da0ff7ed1bd SHA-1: 21c585dec8bae04e34cd723d66802ae53e1389f7 SHA-256: 38bb3d3a6a7d7c622a0837f6ef720e4977440c6fb94128b7a9603b34199aa8fe
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, suggests a lure related to "Briggs stratton parts manual pdf". The presence of numerous external URIs, identified as a link farm on disposable hosting, strongly suggests the document is designed to redirect users to malicious websites for phishing or malware delivery. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/award?keyword=briggs+stratton+parts+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388272/normal_5fe6884a3e50f.pdfIn PDF document text
    • https://tulofezufiruz.weebly.com/uploads/1/3/1/4/131409090/fad57aad5cb660.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/iHvU3lS/hero_rescue_dogs.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/data_structures_and_algorithms_books.pdfIn PDF document text
    • https://cdn.sqhk.co/burexewejam/jaTXDgi/hidden_object_adventure_games_for_ipad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368496/normal_5fe55a95c4373.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/iehhUoo/fake_call_from_among_us_apk.pdfIn PDF document text
    • http://seluluxafej.22web.org/dross_crossword_puzzle_answers.pdfIn PDF document text
    • https://mezowizutu.weebly.com/uploads/1/3/4/8/134898125/bb09a984ed.pdfIn PDF document text
    • https://sudegefaxir.weebly.com/uploads/1/3/5/3/135323135/depaxar.pdfIn PDF document text
    • http://pazolozul.mypressonline.com/impacts_of_apartheid_in_south_africa.pdfIn PDF document text
    • https://sipemesiga.weebly.com/uploads/1/3/4/0/134095973/kozobupepokut.pdfIn PDF document text
    • https://wibixebaroz.weebly.com/uploads/1/3/1/8/131856543/nojom.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/google_maps_earth_view_satellite_india.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kojexeruxub.epizy.com/dokokuradubep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ab4b54-9cb1-45c6-b96d-862a27b8da23/65383704860.pdfIn PDF document text
    • http://mopapawav.rf.gd/can_the_body_recover_from_alcohol_abuse.pdfIn PDF document text
    • http://nononowixumutu.rf.gd/88184435684.pdfIn PDF document text
    • http://fegarezitima.rf.gd/bhoot_fm_september_2018_episode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47217b77-b2a4-4fe4-9952-73fe26aa67c9/sony_ht-ct780_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cc67c65-11c4-45b9-aa0f-ab05cc6963cc/82322850774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a815521e-28f2-450f-942f-2f1720ab0c0c/salary_of_chemical_lab_technician_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95d4f694-868c-4648-9d8f-7aab6e6322ef/mcat_full-length_practice_test_reddit.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_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 5408 bytes
SHA-256: e5ec1a77a30dd3f8af8b642600eee66af9aeb24931b28b48bbaba2bd0b838125
font_01_sfnt_off0000fcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD4 11388 bytes
SHA-256: ebcd6bb0e2b52b4a531305f79cf4d6b4a917ef7be6353e0667f71e4801b2fc21