Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81e9a6443832172…

MALICIOUS

PDF

68.9 KB Created: 2021-10-01 00:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 879e79bb215a122b64b8634effdc2084 SHA-1: 4015016aeb4a6f32435a8aacae6223bcd9236351 SHA-256: f81e9a64438321726b23f4d775f4f4264f570e54107928d34570819bdd81dd1c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to hide a clickable link. The document contains multiple links to disposable domains, including a high-priority link to 'ambulatorioveterinariosismondi.eu', suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://didopack.com/files/tovawemaretotekonega.pdf In PDF document text
    • http://marcth.pl/media/fck/file/luroxukageberifeviwuku.pdfIn PDF document text
    • http://myesen.life/userfiles/file/14380090969.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/61114356274.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/jipod.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/tawewurilaxejo.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/52091195338.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/59442162904.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/nejato.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/67136014709.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/xeteninepirawomugabuv.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/4620610341.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/pogopovapujirakalon.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/84594414202.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/rusugid.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/wefozizizaposexixoguwaza.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/lewemeninaxib.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/76141894027.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/57424345955.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/51190679345.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/jodopuzome.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/7794479065.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109010837582123.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/lediresomowi.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/68173764863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=las+pinas+zip+codePDF 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_off0000b259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA70 10280 bytes
SHA-256: 83b6c119386430668a7593a64341edb01e23c0aee361a0827411e21bbb7fb6c6
font_02_sfnt_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 14440 bytes
SHA-256: a0a8c2da19357c57f5bda074ab1c615dd390d9629401dd25be1e7632ffbc50af