Malicious PDF — malware analysis report

Static analysis result for SHA-256 2623a31eba0d7590…

MALICIOUS

PDF

76.7 KB Created: 2021-06-06 01:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 59a1a22218e7b86b6a85c6d50f994627 SHA-1: 0f2329c4c125bc2ff3d001ff4153837c49186d9a SHA-256: 2623a31eba0d7590171f09fb047389f92970b2a45ba2d9ed02ffff4e0f8146d9
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm with disposable hosting and includes lures for urgency and download buttons. The primary IOC is a URL pointing to a potential malware download disguised as a 'classic tetris apk free'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=classic+tetris+apk+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451353/normal_602eb0680de09.pdfIn PDF document text
    • https://xivexibajewubud.weebly.com/uploads/1/3/1/0/131069970/09a45fb7780.pdfIn PDF document text
    • https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/bujuse_lojumok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408188/normal_602250d37f215.pdfIn PDF document text
    • https://levonosaxedose.weebly.com/uploads/1/3/2/6/132695543/natega.pdfIn PDF document text
    • https://garituba.weebly.com/uploads/1/3/4/3/134335889/3116091.pdfIn PDF document text
    • https://wipedevibenisi.weebly.com/uploads/1/3/5/3/135315865/e261342.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391037/normal_5fe59bb293da3.pdfIn PDF document text
    • https://juwabizaf.weebly.com/uploads/1/3/0/9/130969053/bumaposu_rujul.pdfIn PDF document text
    • https://tuxatijofewimem.weebly.com/uploads/1/3/4/6/134686538/cb9d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://saladolu.pbworks.com/f/conceptual_framework_and_accounting_standards_valix_answer_key_2019.pdfIn PDF document text
    • http://xuvabufoj.pbworks.com/f/how_to_renew_my_passport_online_in_uganda.pdfIn PDF document text
    • http://xifatarege.pbworks.com/w/file/fetch/144690477/how_to_make_income_statement_and_balance_sheet_in_excel.pdfIn PDF document text
    • http://rumusapage.pbworks.com/f/56234231787.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/w/file/fetch/144423558/25247315231.pdfIn PDF document text
    • http://rasetewi.pbworks.com/w/file/fetch/144668919/14288843597.pdfIn PDF document text
    • http://xutosop.pbworks.com/f/dependent_and_independent_clauses_worksheet_grade_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5f96e80-0ec2-4979-9678-a288e56e3a52/what_is_oc_caste_in_india.pdfIn PDF document text
    • http://xorunezagu.pbworks.com/f/lyrics_blooming_story_love_alarm_ost_traducida_al_espaol_dmv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a338ed7-3e77-46e8-ab41-e55cd139af88/tareekh_e_islam_in_english_free_download.pdfIn PDF document text
    • http://sukagafamo.pbworks.com/f/megetakufalobitonuzatogo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BE 2996 bytes
SHA-256: fd7ca904a086d7e4d4549ff606d429cf8a246d475548939133b0259e316ca2cc
font_01_sfnt_off0000ec81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC81 4976 bytes
SHA-256: 0e7c6ad782ed11b81d3e35f6aebf6be2a078d70504c0ab18e4342d719e95b773
font_02_sfnt_off0000fd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7C 11284 bytes
SHA-256: f0f150a697837a15c8c35d3006be5fe0089f8f4063649fe483e311c70215cd5c