Malicious PDF — malware analysis report

Static analysis result for SHA-256 362da81cfb868df3…

MALICIOUS

PDF

67.9 KB Created: 2021-09-29 02:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a3c3bd65fbe3698c54d052283bc8cf10 SHA-1: ee632dbdb7f9a4ecffd183452ff5c2db8d8283d7 SHA-256: 362da81cfb868df35bae4d875c3a0553bb558464d2c38111359a696dc8f381ea
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with a click-outward action, typical for directing users to malicious URLs. The presence of numerous distinct, disposable hostnames in the extracted URLs further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=online+unpaired+t+test PDF link annotation
    • http://uleshuzatshop.hu/files/file/7336854333.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/91056178309.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/xelezaxanerapad.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/saselafagaji.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/56978171536.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/22736536032.pdfIn PDF document text
    • https://ms01bet.net/contents/files/74269462194.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/96394762874.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/84701045313.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/midan.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/95269835561.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/1672392769.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/24236654202.pdfIn PDF document text
    • https://kimcert.net/E/file/janegadevunojunapazubum.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/32080107463.pdfIn PDF document text
    • http://cplust.com/upload/serback/files/20210918141646.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/37038628271.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/2067100029.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/kifijiredopavakadotok.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/87483334269.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/83974396990.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_off0000adef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADEF 14204 bytes
SHA-256: edfddd5c4f54a9977670ad2c4bc18a34dba88d55a721f1d0e107ef3acd757cb8
font_01_sfnt_off0000d10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE921 10392 bytes
SHA-256: 483b9e33f73466894ff08adddc1e5ed8d689031e57dfb886fd8fc4dd690d9cfb