Malicious PDF — malware analysis report

Static analysis result for SHA-256 77fa62980a60d4e2…

MALICIOUS

PDF

71.6 KB Created: 2021-09-08 22:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4cf0582e63f1d7f9b4096cfaf4173238 SHA-1: ed5ec352384c5844ed669dacae1d16da0d3ccf0f SHA-256: 77fa62980a60d4e2fccd0cc03836a2372df4a9a5cba66298238fabc81264d093
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs, including one pointing to a raw IP address, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics points to the document's role in directing users to potentially harmful content hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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 https://laborke.ru/uplcv?utm_term=javascript+patterns+by+stoyan+stefanov+pdf PDF link annotation
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd7b29244---40570116664.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/27371871948.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/wizexutalijegotukeboteko.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/89373767471.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/mabezolasuzusifigude.pdfIn PDF document text
    • http://xsjprinter.com/d/files/zobosokujugubawirujamomag.pdfIn PDF document text
    • http://oodow.cn/upload/file/210905175345759060asob1rl4asgb.pdfIn PDF document text
    • http://momsystem.ru/public/file/bunotajatuzijolubejolus.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/lesixuzexuxopuvu.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/52638549336.pdfPDF link annotation
    • https://egokituz.eus/files/galeria/files/nurumitasozusuzanagorati.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/monogusumikuwe.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/fovixagiwaruzosijofelovu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16131489a7937e---80980717147.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/wokosasubugemotojikane.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/wipopuzalowepomuxenareto.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/79678366260.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/30602986371.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/xutabijaseladigebufef.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/99371823512.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/vixorimunerako.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138664c500db---modabufaxanimabizerazibiv.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_off0000b62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3E 16192 bytes
SHA-256: 44783e6db0175e407fc0fa6a6e2f37c4783eba8228c13c482b591f97adfe1271
font_02_sfnt_off0000f78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78C 10880 bytes
SHA-256: c52256294ce12923edffc6ea1da3e66d7907d95c69b44d05a88634f460bbe016