Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8367be6fd1f023…

MALICIOUS

PDF

77.4 KB Created: 2021-03-22 16:15:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 42c515a4249e39147a51a51174a30838 SHA-1: da7de226ac1b0ac24cfd2d2bb39483707f15e8ee SHA-256: 4b8367be6fd1f02358b738fc27fea723b4451e8414b4a1a8adf6cb7f379eca4d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains text related to learning English online, which is likely a lure to direct users to malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dugedepap.ru/strik?utm_term=aprende+ingles+online+gratis PDF link annotation
    • https://xedutorapul.weebly.com/uploads/1/3/0/8/130813372/rolale-monuz-jenake.pdfIn PDF document text
    • http://dezuforupom.iblogger.org/watosafanedepulaged.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449600/normal_5fd65bec54231.pdfIn PDF document text
    • http://zazujig.22web.org/wukanexotase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420468/normal_6054432643050.pdfIn PDF document text
    • http://narelavupes.22web.org/nunevutakirovel.pdfIn PDF document text
    • https://kabenodetaxixum.weebly.com/uploads/1/3/4/7/134754863/8f276c3de23667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391896/normal_604989220d8dc.pdfIn PDF document text
    • https://dusaxufar.weebly.com/uploads/1/3/5/3/135327992/2a85657016b2bc7.pdfIn PDF document text
    • https://wirafoxojobukof.weebly.com/uploads/1/3/4/6/134608935/f0cdd5cc61ee86c.pdfIn PDF document text
    • https://livakazogoje.weebly.com/uploads/1/3/4/6/134622539/bbcc41fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_c47d0ccd27b446398f39a3a4b91f2d84.pdf?index=trueIn PDF document text
    • http://donarup.rf.gd/19591877674.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_b04412520ff944aaa93034e30bb23bc3.pdf?index=trueIn PDF document text
    • http://gogositanisewu.rf.gd/42685728161.pdfIn PDF document text
    • http://zobagef.epizy.com/medialink_ac1200_wireless_gigabit_router_setup.pdfIn PDF document text
    • http://gumizaxewa.atwebpages.com/ruxoxezagisan.pdfIn PDF document text
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_7573ad581d79427ab636b6739665bc05.pdf?index=trueIn PDF document text
    • http://sokekakeloji.onlinewebshop.net/annamayya_movie_songs_lyrics_in_english.pdfIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_13109f47b9d74e54b820fb0b6a1d6427.pdf?index=trueIn PDF document text
    • http://jevoneloz.epizy.com/valores_civicos.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_aef1ec5240f0420280c7bd495337b046.pdf?index=trueIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/sulirewe.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_off0000ee99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE99 5116 bytes
SHA-256: bb5a9bed865b836df45525bdf714f88d397db65f5d3a23d19cf79eeda089eccc
font_01_sfnt_off0001000d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000D 11796 bytes
SHA-256: d0b47e6cf4d78654cd619a8ee3137cc060593f10c756dbb91a00ba7becef21e3