Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a97b26ca9e01b85…

MALICIOUS

PDF

69.2 KB Created: 2021-04-11 05:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 779d3c68eee8692359b18b3c55141354 SHA-1: edf1fbd528ac7a902780660e5e810a881bd4d23c SHA-256: 3a97b26ca9e01b8537bf7928574612a9a7a26a7da3dac8584a4889e30c7b7b0c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a prominent one leading to 'xajibur.ru', suggesting it's part of a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to a popular song, aiming to trick users into clicking the embedded malicious link.

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 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://xajibur.ru/strik?utm_term=river+flows+in+you+piano+yiruma+original PDF link annotation
    • http://damewumesigalut.medianewsonline.com/hrm_case_study_questions_and_answers.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/16519636937.pdfIn PDF document text
    • http://bofesota.66ghz.com/gajumebuwedirodetesot.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/how_to_find_hotpoint_fridge_model_number.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/48325133573.pdfIn PDF document text
    • http://wefilevazobakeb.mypressonline.com/sidarikidoxutumepo.pdfIn PDF document text
    • http://bozakotoluzi.iblogger.org/31464626075.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/used_garmin_rino_650_for_sale.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/0fbe6108-f2a6-42aa-b8bb-00e8c27eb2a1/79396739803.pdfIn PDF document text
    • http://lasikisitikuve.epizy.com/ongole_weather_report_come.pdfIn PDF document text
    • http://gezojetisab.epizy.com/sample_dinner_party_invitation_template.pdfIn PDF document text
    • http://wawikoduvebakap.onlinewebshop.net/rig_veda_in_bengali.pdfIn PDF document text
    • http://tapedinupob.rf.gd/annihilation_of_caste_free.pdfIn PDF document text
    • http://nerelikeg.epizy.com/82950590588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d44d3d8-71f5-4549-ab93-99bb7e46c6b1/howard_miller_grandfather_clock_weights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c93f1ad8-6ab0-4ca4-9710-4fc7a7111867/canon_xha1_camcorder_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd4e95ab-5817-4eac-b5a8-8ec1381e366d/perfect_english_grammar_second_conditional.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_off0000d1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F6 5480 bytes
SHA-256: 996716f87366debb3ab17e985ceec8d0be2122065c99113d61d6d8d8dc620056
font_01_sfnt_off0000e4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AF 10188 bytes
SHA-256: 5530fca1e5193a6da086f59159b9baf0b1c2130bfb7a5f009a8dd1c1e054f41b

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