Malicious PDF — malware analysis report

Static analysis result for SHA-256 391cfe5bf4722c16…

MALICIOUS

PDF

70.4 KB Created: 2020-12-19 00:11:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d4308f4b26d41db5fce7e7b080c6a921 SHA-1: 240696c4813a815396530f72f2faa51c09943eb5 SHA-256: 391cfe5bf4722c16bfaaca1bf26b7ea84c6f8f3f38561b47375a7b22f4fc5daf
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL, 'https://traffnew.ru/strik?utm_term=sapphire+dragon+claw', identified as a potential lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's structure is designed to host many links, reinforcing the phishing or distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffnew.ru/strik?utm_term=sapphire+dragon+claw PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413109/normal_5fcc94c55ba23.pdfIn PDF document text
    • https://tesejusijup.weebly.com/uploads/1/3/4/7/134704228/gazipotabenakovobaj.pdfIn PDF document text
    • https://laputamobo.weebly.com/uploads/1/3/4/7/134763437/fixeduj_pirirug_liwipivexen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368997/normal_5f958ca77527f.pdfIn PDF document text
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/7840005.pdfIn PDF document text
    • https://joxorarosod.weebly.com/uploads/1/3/3/9/133999743/665ee4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc52f513398ff751549c769/t/5fcac98ce4e49857e219a4f7/1607125389721/noah_bottle_full_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35bef6bb-677c-4693-8a2a-44238d617f55/vawebuvevamuzunowanapemen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d99320-e8bb-46a4-9bc3-78793c29ad25/xizemipafaku.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/ac_market_apk_file_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deb3fafc-6d50-477a-977b-017e030373f6/78503523188.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf53f9c7-ebb5-4a8d-ace8-c979261d560c/nawugutosirunaperakem.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbffb205e8e827d4288adb3/t/5fc1a39bf8cdb769c6214f48/1606525853325/cuisinart_instruction_manual_ice_cream_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/new_bollywood_movie_2019_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/891e4fb8-11f8-45b0-83c1-a7534eb4a17c/33494304450.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4f719ee0f32b874a37e6/1606373239204/mp3_music_downloader_apk_for_pc.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6647da5bc066edfcb2426/t/5fc8f8498ae58f639390c9c3/1607006282769/senafuz.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_off0000d5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D4 5352 bytes
SHA-256: 432adbccab39a08fafc35260252473f7e57e55a42e6bd8797d25f5daa77074ea
font_01_sfnt_off0000e813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 10864 bytes
SHA-256: df47a89d35bd293d861585615e32e7a4b5ee430ab712649b1d44f2316ffea2dd

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