Malicious PDF — malware analysis report

Static analysis result for SHA-256 63bb63e3ac4cdfdd…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 02:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d4ebb267e56ec7d5de2f48de111f83d SHA-1: 624e48785e5ed815d5ed07df6b37c2bf12529feb SHA-256: 63bb63e3ac4cdfdd231a47fb081d636396cbce3f4e69d4c020cd589c0d40a713
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document instructs the user to open a password-protected archive, a common tactic to bypass gateway security. Numerous embedded URLs point to potentially malicious PDF files, suggesting a link farm or distribution mechanism for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://beiwendq.com/data/attachment/file/batukabegiluximukeva.pdf In PDF document text
    • https://fsreloading.com/userfiles/files/31813434882.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/51516386839.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/bodokibunovuletufafo.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/73555355387.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/61647432598.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142629d79556---vofule.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/lufuzabemegamafijoduwad.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f03d7364c0---32219983125.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/bamakofiruwunajakezasena.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/kexipotiguxuxozazibag.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/011233422355.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/mirolu.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/15285435174.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/60585588972.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/dapasalifixobesuxu.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/33323814323.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/99433624134.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/6323803509.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/86289654122.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/57910258397.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/xikakaraxap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=screen+lock+app+for+androidPDF 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_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97E 10512 bytes
SHA-256: 2d1ce33ed4b8c4580e74271e9e977a92d9e1c1e301ae65d42560e364b1db8a61
font_02_sfnt_off00011172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11172 17144 bytes
SHA-256: 4c0cbb037cb87196693004ad280a476da799b1af7a4f16d7da188751e65af4d8

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