Malicious PDF — malware analysis report

Static analysis result for SHA-256 80304e704a02183b…

MALICIOUS

PDF

84.0 KB Created: 2021-09-23 18:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf6e7621b2f49380f1637b146a403349 SHA-1: 7e526afddb16d4c741864cd3b6a0f6116d5b659b SHA-256: 80304e704a02183bc83972eb1722bdf0bec33ef34afd163fea0cf6afbdead0e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to redirect users to malicious sites or downloads. While no executable scripts were extracted, the presence of multiple embedded URLs pointing to PDF files on various domains supports the attack pattern of a link farm designed to distribute malware or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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 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://valergences.fr/userfiles/file/48340163464.pdf In PDF document text
    • http://soft-pro.hr/upload/datoteke/64105165493.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/99397005340.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/28745972617.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210911075700_jmg984.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/vezojekawibizipixeme.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/zulozexiwopalajep.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/1618331864.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133be4aa0f48---samemepew.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/mutakawogagasawixapewuvi.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/45967870297.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/11091620539.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/lojorivosixapofomaj.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/nemuva.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/39443666070.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/xovotomerifawuwuduzik.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e76fddaff---86526892806.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/16449110189.pdfIn PDF document text
    • http://xtra360.net/campannas/file/xopawetu.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/zagunebitatiniresaweloz.pdfIn PDF document text
    • http://wdnederland.nl/file/26231025610.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/remorobazuzovosifuz.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202197171123606.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/zifabuvuwurad.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/dututa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=applock+download+2021PDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE485 10368 bytes
SHA-256: f3f14355f04149dd571b6330be85d8c3331c6938a6bc118cfd7275e0e53f7f7c
font_01_sfnt_off0000fc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001144f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144F 17972 bytes
SHA-256: e4beda401eea0a96877e206f6b82b611a474003c03493fffb115967cf449153e