Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7319de0d29f9ac2…

MALICIOUS

PDF

72.1 KB Created: 2021-09-24 21:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc25c4cf47daef968063b548bc6f3f10 SHA-1: 7c3ff67301eca4d4106c89af31c20596f470799a SHA-256: f7319de0d29f9ac2da18a966983e2c8aca53425bc1cd136863fdc851e688858d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on disposable domains or IP addresses, indicating a link farm for malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://contelex.it/userfiles/files/vokitonosaki.pdf
    • https://alpinashop.bg/files/9067764399.pdf
    • http://nollve.com/img/editor/image/file/wezorejadeson.pdf
    • https://aawyx.com/sites/default/imageuser/file/6135509253.pdf
    • https://graveyards-fuj.ae/userfiles/files/72058784253.pdf
    • http://stefani.cz/fck/file/fagomuv.pdf
    • https://gesema.com/UserFiles/file/febudogurifu.pdf
    • http://ambulatorioveterinariovianello.eu/userfiles/files/73559203621.pdf
    • http://140.121.161.111/ckfinder/userfiles/files/53683288809.pdf
    • http://the-bom.kr/upfile/files/rulige.pdf
    • http://immobilieninvestors.net/userfiles/file/55601966116.pdf
    • http://mobydick-band.de/fckdata/file/tumuwubidomezawewibodizes.pdf
    • http://sakurahoaanhdao.com/webroot/img/files/vufeb.pdf
    • https://colakcivi.com/userfiles/file/51541613908.pdf
    • http://insureavisitor.com/userfiles/file/86950422599.pdf
    • https://isuzuphonoi.com/data/dulieu/files/50283572511.pdf
    • https://guruvinodji.com/Userfiles/file/78053572564.pdf
    • http://zuche0551.com/upload/file/palugozo.pdf
    • https://atlas-consulting.ro/fckeditor/fisiere/file/70188754827.pdf
    • http://lagunarent.lt/ckfinder/userfiles/files/nivodepawurolowezu.pdf
    • http://dralituncer.com/userfiles/file/sekexipuxilofuvona.pdf
    • https://behagi.eus/files/galeria/files/7719821598.pdf
    • https://balarampurblock.in/ckfinder/userfiles/files/65363585082.pdf
    • http://youngshiny.com/userfiles/file/1631774285.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sanatana+dharma+book+malayalam+pdf
    • 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_off0000b554.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB554 16792 bytes
font_01_sfnt_off0000cd6b.bin
62cde2058010b68af525d3d02018b9d7bc988bd89bbf145178abf8c0b708bcf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6B 10792 bytes
font_02_sfnt_off0000e5d1.bin
75092819d5d0cbd37ec6516c9dbf29ecc885415416f6da710c426d06e67a3418		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 17408 bytes

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