Malicious PDF — malware analysis report

Static analysis result for SHA-256 2388ba19678f3107…

MALICIOUS

PDF

79.5 KB Created: 2021-04-06 15:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bca1cb8cb5308aea6ec61833ea6a8867 SHA-1: b037d583e63d4f9c1700311bbcad138102db80d3 SHA-256: 2388ba19678f3107540c586238e903242220c329c05846acdbbf87baf6afe2a5
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, appears to contain product-related keywords, likely as a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://zajinet.ru/strik?utm_term=powerstation+psx3+portable+jumpstarter PDF link annotation
    • http://site-shop.xyz/jasejarutowaxijhj00.pdfIn PDF document text
    • http://avit0.cc/wopofuraxiwa1yvbv.pdfIn PDF document text
    • http://rivezetufizi.iblogger.org/40909525094.pdfIn PDF document text
    • http://fodefon.getenjoyment.net/english_bible_king_james_version_free_download.pdfIn PDF document text
    • http://pihodze.com/programming_a_genie_model_7055_garage_door_openerootx5.pdfIn PDF document text
    • http://boevoenlp.com/polk_audio_hts_12_subwoofer_review8w5kf.pdfIn PDF document text
    • http://doucheapp.xyz/jorunigarxvggl.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/sony_icf_cs15ipn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9dd02728-8b0e-4c16-8a5b-31b14a6ec887.filesusr.com/ugd/d8c3ed_16fe6d60371040ba9a0b018bbdc52800.pdf?index=trueIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_d7f5e841eabb4723a8135d31be06093d.pdf?index=trueIn PDF document text
    • http://fexewon.rf.gd/firofaretiseweku.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_224b62768b12418b85b0ba2e15bcf54f.pdf?index=trueIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_327a81250ba84f8eb745df08c02cc514.pdf?index=trueIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_f57b4bf95713457896edaa9ef20286d4.pdf?index=trueIn PDF document text
    • http://tosurok.myartsonline.com/7340031677.pdfIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_a2f75a67ea1f45d2806433689250266c.pdf?index=trueIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_f129986904c247c684649c962ffea3c0.pdf?index=trueIn PDF document text
    • http://tefotesibeto.epizy.com/vidovaz.pdfIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_6c0e101f8ce34d0c9fb09abddfe0664d.pdf?index=trueIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_6edca978682d4892a4745c78994b7ec8.pdf?index=trueIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_a04c946922f049488e378dd5aa15d2eb.pdf?index=trueIn 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_off0000e7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C1 5388 bytes
SHA-256: d07eb9ac20627f36a75c0ad28a7e401b38bb35b7f82e1550dae2026d7a97f8bd
font_01_sfnt_off0000fa02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA02 11920 bytes
SHA-256: fe40c77c9160380b9f52da58351703807a0f83928a850de9dbead3d95b62760d
font_02_sfnt_off000121ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FF 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c