Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39fa64666467477…

MALICIOUS

PDF

82.4 KB Created: 2021-03-18 06:14:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9676e5dfc0df0dbcac3fc2da5373c4ef SHA-1: be481cc91d46af3030e1cb5eac667c9624f87899 SHA-256: a39fa64666467477c900736d6639fafe805737dc8b356f75581df0dbf124e141
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • 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://fokemale.ru/award?keyword=bailey+and+love+25th+edition+free+download+pdf PDF link annotation
    • https://cdn.sqhk.co/libegavezu/a0gijel/application_for_leave_in_office_format.pdfIn PDF document text
    • http://nakotigolajeg.scienceontheweb.net/33933657206.pdfIn PDF document text
    • http://dabedera.mygamesonline.org/vakusaturabetuwi.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/which_graco_stroller_is_best.pdfIn PDF document text
    • https://xapukaxefibaj.weebly.com/uploads/1/3/4/7/134772468/jajotikurilubuju.pdfIn PDF document text
    • http://tuwiximobibatud.iblogger.org/on_my_way_song_ringtone_pagalworld.pdfIn PDF document text
    • http://gefaveje.22web.org/how_to_say_family_doctor_in_spanish.pdfIn PDF document text
    • https://tifimiwarefimi.weebly.com/uploads/1/3/4/8/134895051/179930.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/qijPfif/satomi_dogwood_tree_pictures.pdfIn PDF document text
    • https://lilususuki.weebly.com/uploads/1/3/4/3/134317990/4c25900f46837bd.pdfIn PDF document text
    • https://fotelosalif.weebly.com/uploads/1/3/4/4/134463398/paxik_sujare_poximolu.pdfIn PDF document text
    • http://galosidijixiwu.mypressonline.com/john_deere_x320_pto_problems.pdfIn PDF document text
    • https://konomotawet.weebly.com/uploads/1/3/1/3/131379362/2080007.pdfIn PDF document text
    • http://dusosax.66ghz.com/convert_avi_to_mp4_android_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/honeywell_-_white_quietset_cooling_fan_hyf260e1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1331cb9f-1ca6-46c5-b62d-67f220301299/jaribedevasekaba.pdfIn PDF document text
    • http://xinudekewukipi.rf.gd/wifigude.pdfIn PDF document text
    • http://wugijin.rf.gd/65180213117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e7ab30-0571-47a8-85ba-6c00ec8600bc/65577629838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642f9f42-7d19-4d4f-86ec-2fd8c4c5ac3c/covalent_ionic_bonding_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/nuraxir.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/risk_assessment_template_health_care.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/46590387953.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_off00010291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 5512 bytes
SHA-256: 7adb8bf50d8d01a864f6553d0bed9b7de845c108c0c1d4924d8ee4cfe75894c4
font_01_sfnt_off00011572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11572 10744 bytes
SHA-256: df072e6f5b61a95f6b54d2dd441bf8fefaad0160e465e73fbb9326505e3765ba