Malicious PDF — malware analysis report

Static analysis result for SHA-256 cafc65d0a83bd738…

MALICIOUS

PDF

70.8 KB Created: 2021-02-25 01:57:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 12412c1923f334141af586a5b9d678a0 SHA-1: 7052d8c6268b6b4568671704e52364decb46b1cf SHA-256: cafc65d0a83bd7388507d9e848045f91fec1eab3e546ffd8306d1435ac8f5bee
184 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain keywords related to the malicious URL, suggesting a phishing or scam attempt. The presence of numerous links hosted on disposable domains further supports the classification as a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=2003+jeep+liberty+2+lift+kit In PDF document text
    • http://kamikofonem.mygamesonline.org/toro_lawn_mower_manual_recycler_22.pdfIn PDF document text
    • http://katipef.medianewsonline.com/mastering_data_structures_and_algorithms_using_c_and_c.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/past_participle_spanish_worksheet.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/donorowelomumoxurawu.pdfIn PDF document text
    • http://moxugov.22web.org/korg_sv-1_88_red.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/how_to_pick_godparents_for_baptism_catholic.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/how_to_test_words_per_minute_reading.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/zefijotakovukefudamududug.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/what_happened_in_shadow_and_bone.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/everstart_maxx_3_amp_6v_12v_automotive_battery_charger_bc3e.pdfIn PDF document text
    • http://tapadobav.iblogger.org/vufusipiwelezorut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://powajokex.rf.gd/hole_celebrity_skin_album.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/90313599512.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/star_trek_into_darkness_cast_carol_marcus.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_off0000d9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AD 5232 bytes
SHA-256: 57854ba80fa3219a6b824acbdda2329424b6a521bb168358f54fd3a297d8f1db
font_01_sfnt_off0000eba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 10248 bytes
SHA-256: 4ed27ab0636e7334c1e10557173dc9d8baafba0bd8d00d8fa6be98ebfee98d8c