Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f87ca366f4c1488…

MALICIOUS

PDF

103.8 KB Created: 2021-04-01 01:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e5efb6ca41563dd48434e7630203a1cf SHA-1: 8b54a024939a27318d30a98ce5e18e86842f0ec6 SHA-256: 1f87ca366f4c1488b4da34303daaa531c4aa40377e6c339eed02477afd2bf81a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with at least one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://pelibifir.ru/123?utm_term=android+floating+action+button+default+size PDF link annotation
    • http://avtoshtorki.shop/2nd_grade_english_textbookzphdr.pdfIn PDF document text
    • https://widijozitumude.weebly.com/uploads/1/3/4/6/134688085/183b47b8ef8.pdfIn PDF document text
    • https://refefutetolesom.weebly.com/uploads/1/3/4/8/134868450/lekugatuwoli-tizugojilifasuf-xavefazo-semez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_604bc60b3847f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471512/normal_603c246c14ec6.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/72775068597udoo5.pdfIn PDF document text
    • http://justamorem.com/waxom93nps.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417318/normal_6007e05ad04ca.pdfIn PDF document text
    • http://nukadaz.iblogger.org/51239687729.pdfIn PDF document text
    • http://kudopifupelixi.22web.org/gufobebukikuvuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406463/normal_6033dc345b731.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376105/normal_5fe4982589ec8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419818/normal_5ffa15037c6cf.pdfIn PDF document text
    • https://vebeviwikime.weebly.com/uploads/1/3/4/3/134317270/xivelinusu_mazewolagejet_rateg_torapikivin.pdfIn PDF document text
    • http://avtoshkola-region26.ru/pixepikoz0nz4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385434/normal_6020a4ded726d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482854/normal_5ff19aacc97ae.pdfIn PDF document text
    • http://bonmarket.site/gears_of_war_4_crackwatchoaxtu.pdfIn PDF document text
    • https://simomoluxaruto.weebly.com/uploads/1/3/4/8/134859410/3051960.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kekumedefiwewuk.rf.gd/8566238747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa18006-7a9f-4800-91a1-c6e2f65a8441/howard_leight_impact_sport_vs_bolt.pdfIn PDF document text
    • http://jibitolokadidus.rf.gd/55219244447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/129d7d4f-64ba-47ee-ab6b-d4c1b8f0b934/joe_crab_shack_menu_prices_greenville_sc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b101c5d-f4d9-4946-afdc-3a76c345bc8d/32389173305.pdfIn PDF document text
    • http://derijumofode.rf.gd/simple_english_words_with_meaning_and_sentences.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34c2a7e-dcc7-4571-979c-7a2c4eb66272/torinitizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc7cbca7-2d21-4d8a-94c3-b13b71dd126e/wunewevijazawifatazejaj.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_off00015bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BCF 5368 bytes
SHA-256: 3c750aa25d01bcf7520664ac2fe9be17f0d3b48ee1a5905a83c627a2015b104d
font_01_sfnt_off00016e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E29 10468 bytes
SHA-256: 8881e2dcc71165f83e2cdcedd353ebfcd6a4bec9fe6b040bace11df8438ada20