Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f8bb182cb03d94…

MALICIOUS

PDF

112.3 KB Created: 2021-04-29 20:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 03f1d985889d88f1ca536adebe238443 SHA-1: b7c8f1a35ac9d8e773a11dd91da584ca99598375 SHA-256: 20f8bb182cb03d9482a7132ea1fdcfef2b522f86f54200a16aae2360e4b4bfe3
226 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to obscure malicious activity. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to decrypt a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 7

  • 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.
  • 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://mezovuduw.ru/strik?utm_term=little+red+riding+hood+pdf PDF link annotation
    • https://cdn.sqhk.co/mudemodox/Niiheln/anime_making_app_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408001/normal_604e387c2b10f.pdfIn PDF document text
    • https://cdn.sqhk.co/fejipotegevi/hhieyja/hillsboro_drive_in.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448126/normal_600fe395c8516.pdfIn PDF document text
    • https://cdn.sqhk.co/neviragar/VbgfmpL/big_blue_marble_waxhaw_north_carolina.pdfIn PDF document text
    • https://cdn.sqhk.co/kusedesomawa/dKbiaPJ/44768183219.pdfIn PDF document text
    • https://zonozedu.weebly.com/uploads/1/3/0/8/130874021/73fe5a.pdfIn PDF document text
    • https://cdn.sqhk.co/gapalagabig/jihCid4/atlantic_fleet_gameplay_espanol.pdfIn PDF document text
    • https://dovoviwum.weebly.com/uploads/1/3/0/7/130776035/40d92.pdfIn PDF document text
    • https://zexerimapepu.weebly.com/uploads/1/3/2/6/132681444/2fb02082.pdfIn PDF document text
    • https://cdn.sqhk.co/kamavedes/G8ihLD9/fakiwebuso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389823/normal_5fce626c375f0.pdfIn PDF document text
    • https://cdn.sqhk.co/denugesugumu/XqKihhg/xidozipewikomuregomezi.pdfIn PDF document text
    • http://mozakotefeg.22web.org/bear_cruzer_lite_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/padixemugex/iFjihjg/sovawevarufutavaguga.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/ggDKvhi/pupewovu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409244/normal_5fd74fbb538a2.pdfIn PDF document text
    • https://cdn.sqhk.co/jajejige/56jahdO/contemplates_definition_law.pdfIn PDF document text
    • https://sugodaxekot.weebly.com/uploads/1/3/1/8/131872070/407248.pdfIn PDF document text
    • https://fuzewejobedogu.weebly.com/uploads/1/3/1/4/131482867/metuw_gogasik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458145/normal_60245b458ed58.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wawutanow.epizy.com/34786607628.pdfIn PDF document text
    • https://c208ddc4-37ec-4cef-823d-79aeaa8cd68a.filesusr.com/ugd/d34c4d_74054c8a43f34b8c9a80aaf6f2bf4fcc.pdf?index=trueIn PDF document text
    • http://gegoxasedabuf.rf.gd/13157166559.pdfIn PDF document text
    • http://mibelajute.epizy.com/kufexazifipozevojetitik.pdfIn PDF document text
    • https://8cff2b46-3289-4d4c-b6d5-84761b4963bb.filesusr.com/ugd/c91274_9e204fcf33cb447aab9d4d8b05d81c9b.pdf?index=trueIn PDF document text
    • https://8319d365-0190-44ee-b2f3-e76f6fd230eb.filesusr.com/ugd/112488_e8acee0bea014e569b8f7314545f0993.pdf?index=trueIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_68580d7231a84880bd54fb25bd25e3b3.pdf?index=trueIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_d0727757e3e54358a10055c6364e4f02.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EDB 4856 bytes
SHA-256: c69f31aeebba01d390a0dc2b227fec2ac273c657b9208ea16f3610c2d3e01223
font_01_sfnt_off00017f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F5A 16224 bytes
SHA-256: 62c40c4e252f824aeb4f9f5c93a6ed8c02806e8d67c9e790916e37dbe7f58850