Malicious PDF — malware analysis report

Static analysis result for SHA-256 c265f2fc11077943…

MALICIOUS

PDF

87.5 KB Created: 2021-09-11 04:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 913e6061dd21162c11e94bb2cb1911ac SHA-1: 3b7c8ae1e28d9395e4477182cbd93543b4c1b906 SHA-256: c265f2fc110779438bc61c328135a661033f7ffe6abbb1c3388703914d519127
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating malicious intent, including random URLs and link farm characteristics. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely used for phishing or distributing further malware. The embedded URLs point to suspicious domains, and the PDF structure suggests it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://ffarchitettura.it/userfiles/files/27392087974.pdf
    • https://luckysurface.itweald.com/uploads/files/6137b4a93fbbe.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/bv5reafe9963lbcqs5r7sv72i6/gufegevajedid.pdf
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/pukiwutiminolit.pdf
    • https://xn--z4qq44i.tw/upload/actfiles/62001123742.pdf
    • http://rungruangsteel.com/public/upload/userfiles/files/dabunepi.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6452a22e2ce462c4527b7cf2ffa9fd0f/binatofiferiboxewawugur.pdf
    • https://hinodanang.com/uploads/image/files/putupufup.pdf
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/83300024520.pdf
    • http://goldenbaycruisesagent.com/userfiles/file/sevoponorenitebonowamo.pdf
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/35865866249.pdf
    • http://jmk.kr/ckfinder/userfiles/files/kifiwasis.pdf
    • http://vdadanang.vn/app/webroot/assets/files/jizofezisamusakonet.pdf
    • http://rkmaster.ru/uploads/files/68774011187.pdf
    • https://cingenito.ca/upload/editor/file/fizuw.pdf
    • https://ckmandarin.com/uploads/27520743347.pdf
    • https://mimpiindah88.com/contents/files/zurogor.pdf
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/tavimukagaruxizetuned.pdf
    • http://ilkemymm.com/image/files/taruwozasifajel.pdf
    • http://saxonrt.hu/img/userfiles/files/10042610657.pdf
    • http://energywork.pl/userfiles/file/68194849539.pdf
    • http://yoshitomo-kokubunji.com/jcfiles/file/pubiritalesetamagaliw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=u+are+beautiful+in+spanish
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd7.bin
9ab50f5f5657e24ddd08a3c9458951e2755d4b5321e41eaa1400a80755153e37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 20216 bytes
font_01_sfnt_off000120d1.bin
d2e1c2dc3b1aa9c3248cf52c2134c424ea85503952739eb93db9236f32113c57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120D1 10584 bytes
font_02_sfnt_off000138a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138A1 16792 bytes

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