Malicious PDF — malware analysis report

Static analysis result for SHA-256 622afc11f48dd8c0…

MALICIOUS

PDF

74.7 KB Created: 2021-09-19 19:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d75d823de965a2505dfe4008cf9c569 SHA-1: ffcc9f70ed14e94df8aeed283b9869ef6110394f SHA-256: 622afc11f48dd8c08de92bd0da83978cec127ad6aabc4e5a5e394c5efe3a1bdb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to a link farm, suggesting a phishing or SEO poisoning campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, indicating the document is part of a scheme to distribute content via disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://mclarenquartz.in/ci/userfiles/files/kunorujagez.pdf In PDF document text
    • http://niezapominajkowo.eu/userfiles/file/dukemukubum.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/welomow.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/59126006930.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/gasuvuwox.pdfIn PDF document text
    • https://norservis.cz/files/files/8773739892.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/91942302509.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/sogagukamafalob.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/93994626283.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/xurejenuwagosudepani.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/vuvoperokosuxolejexok.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/diwakopukovorisilitesizof.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/43427879634.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109071050359511.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/80412305571.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/pofoxopopanaxovoluzeler.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/45511192056.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dd02fb8266b2d22d4a44ecd53ef293b2/botojokukewijegamuwora.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/48034752510.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/13425800056.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/witosesowef.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/94619306659.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23012886349.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/28369099850.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/mivipoxiwa.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/rulegogikitaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=class+11+book+pdf+download+mathsPDF 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_off0000c19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19A 10840 bytes
SHA-256: 0f2c2f530d971e1802f74265312e79a84d73c2bc81c1505c595ed37f47d50ad7
font_01_sfnt_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 16608 bytes
SHA-256: 7192ad1ca67275f97f76215c2bf76ea5259709d69c1b9eccac73ecb6f94cc802
font_02_sfnt_off00010509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1