Malicious PDF — malware analysis report

Static analysis result for SHA-256 c997fdf373ef0a0a…

MALICIOUS

PDF

78.6 KB Created: 2021-05-17 02:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6773db8f5a29bab61216db00e84424a2 SHA-1: 4259e9a5c31a19d41b19b003322ed2b6de341ddb SHA-256: c997fdf373ef0a0aeeaac5fc1ba6e08baa56188741fee0222fba7d1dd22f4d5c
234 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive 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 0.9998

Heuristics 8

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://midufefew.ru/strik?utm_term=c+programming+projects+for+beginners+with+source+code PDF link annotation
    • http://womanaratiso.iblogger.org/bifewetubikuk.pdfIn PDF document text
    • https://rasozonikazip.weebly.com/uploads/1/3/4/9/134904665/2061659.pdfIn PDF document text
    • https://nenomoxemobare.weebly.com/uploads/1/3/6/0/136010140/levavujibunu.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/a28f8c61.pdfIn PDF document text
    • http://fesuzeroba.iblogger.org/apus_launcher_apk_no_ads.pdfIn PDF document text
    • https://dozisinabi.weebly.com/uploads/1/3/4/6/134646642/3414188.pdfIn PDF document text
    • https://bomobokoluv.weebly.com/uploads/1/3/1/4/131437025/segujaduluxojew-ragumad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_9760f0cd51c74cfca41fa448dd3338ee.pdf?index=trueIn PDF document text
    • http://jupilabezisetif.epizy.com/wagitisatefojasulil.pdfIn PDF document text
    • http://zojimako.rf.gd/chander_pahar_bengali_movie_song.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/best_powerpoint_templates_2007_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ce3a3ca-67cc-4f11-8827-bfb349e2866a/zedadinimugedewozaz.pdfIn PDF document text
    • http://fipojeraxuw.epizy.com/magazine_layout_design_free_download.pdfIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_5c4f590c17b74a8da3e67e87989924a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0abd2891-4205-426a-be82-f5f31cf203f9/statistics_for_dummies_kindle.pdfIn PDF document text
    • http://vubedarav.epizy.com/pub_androides_barakaldo.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/fallout_new_vegas_character_face_creation_guide.pdfIn PDF document text
    • http://legatuwaw.epizy.com/icomania_icon_quiz_answers_19.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e37f8738-7fab-46ee-a024-f7d961165025/rebecca_daphne_du_maurier_audiobook_unabridged.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_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 5752 bytes
SHA-256: a0a0752b58c8be8138fc42e63d5292a1a9973998c5e7d07b47f55d8fd8bc82cf
font_01_sfnt_off000109b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 9796 bytes
SHA-256: 9424f22946f251715f1fd476349b2ae9baf03db31cf99f1d4b31161c7b22b78a