Malicious PDF — malware analysis report

Static analysis result for SHA-256 759299fc448e2abd…

MALICIOUS

PDF

73.2 KB Created: 2021-09-12 10:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 45b807766c23e792eb246ba60720540c SHA-1: 7dce5663521af035292ed024c1dd684f0fecf05e SHA-256: 759299fc448e2abdf79a1005e79f868581735ded5bf4acc076da217729b00c95
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high-confidence ML classifier indicating maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links, potentially for SEO manipulation or to redirect users to malicious sites. No scripts were extracted, but the presence of external links points towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 4

  • 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://huntic.ru/uplcv?utm_term=funny+words+beginning+with+n PDF link annotation
    • https://tonthephunglan.vn/upload/files/43417319844.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109040721538587.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/polumojiwajaxug.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/73802010800.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/gejorefavopuxog.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/fopupoz.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/5823757467.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/mowapesuvegip.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/1c6bcc1cda98d5083f1b21767da33151/zesagomim.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/75360213353.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/4572028149.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/56402368061.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/venafolur.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/36044388978.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/mosetegojezowevaxaruka.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210904015946.pdfIn PDF document text
    • http://njchemland.com/upload/files/moniremuralenodepi.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/79643915576.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/wavalimakilidixeju.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/vipekawaxor.pdfIn PDF document text
    • http://video-cycling.de/files/file/vijapigelimagizirezado.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/98105182448.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/zedevuvajesun.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://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_off0000ba8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A3 10736 bytes
SHA-256: b80709c5883c6b3e96395ed27940eed1048c2f7d242aee6bd0487afc3c08a043
font_02_sfnt_off0000eb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1B 17048 bytes
SHA-256: cc400869d475fdb82152efb3a861b4bedc48195f9e97d4755391dbb1b1c5708a

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