Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dce53686b5707dc…

MALICIOUS

PDF

76.2 KB Created: 2021-03-04 17:44:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d4c95eb5f63876ae017fa7a1bcbb2df9 SHA-1: c1ce2bc8752643a8599534be7aad368aa633f5eb SHA-256: 7dce53686b5707dcf1d0cbaffa6a34b5e6392cf9b86f95fd56912eeb704a2053
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers strongly suggest malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and heuristics point towards malicious content designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/award?keyword=warcraft+3+original+purchase PDF link annotation
    • https://cdn.sqhk.co/relulapezele/egc4ii6/flipper_basketball_slam_dunk_pictures.pdfIn PDF document text
    • https://xufetujada.weebly.com/uploads/1/3/4/7/134745175/xinomevajikomov_watul_lonepafigatir.pdfIn PDF document text
    • https://gosasolana.weebly.com/uploads/1/3/4/5/134523876/2904750.pdfIn PDF document text
    • https://nonovobuzodeku.weebly.com/uploads/1/3/5/3/135348203/farivoloku.pdfIn PDF document text
    • https://kalogipewaga.weebly.com/uploads/1/3/4/5/134595512/vosokodixeburelejux.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/FEUVjhG/80177692657.pdfIn PDF document text
    • https://cdn.sqhk.co/wofazexej/vgejihe/spacex_live_fox_news.pdfIn PDF document text
    • https://kefelewupu.weebly.com/uploads/1/3/4/7/134711224/pefire-wezak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_3979dfeb84bd4b989fd69ee41b267f9c.pdf?index=trueIn PDF document text
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_6029414460e44804ba297353e08320ca.pdf?index=trueIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_72834caf563041b3a3ea6fb1161fd078.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/muffin_s_halo_guide_for_blind_dogs.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/jupumenudebadotarilowu.pdfIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_62718aa1fa6f417d9326d248f727cfc3.pdf?index=trueIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_af9f38ba1e1f4ee986fa50f8e6421a05.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/hackintosh_building_guide.pdfIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_f045231e16fc4471abd5794aaaf91711.pdf?index=trueIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_b247fdedfe0a4f038d080ea25a6d77f9.pdf?index=trueIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_559016aae0aa447f979d5e6e95ffb1e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/d_d_4e_armor_feats_dnd_5e.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_off0000ebfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFD 5456 bytes
SHA-256: b01f394c0c3a9b88191672c3d7a5e844c3975d75b8d9fe777f442088a6d957d3
font_01_sfnt_off0000fe97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 10684 bytes
SHA-256: b430ed33347f89ba7fff7628a13ed7691151c762027c767f6f809212fdbd1d49