Malicious PDF — malware analysis report

Static analysis result for SHA-256 40927ebd00024180…

MALICIOUS

PDF

84.7 KB Created: 2021-09-12 17:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b76c8a6c927edabb172cf2a5134c0a08 SHA-1: 1d06a805364b17d522d750af073cfb73df0be817 SHA-256: 40927ebd0002418026f321931d2ffbb8a38276f670f3b75c52567fb300e8ac37
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as http://oilspecchem.com/files/ladivalujepijiri.pdf, are likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oilspecchem.com/files/ladivalujepijiri.pdf In PDF document text
    • http://nhasachthunam.com/upload/files/91056178309.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613b55a5acae1---lugufitivivemafedirolaluz.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/pezuganosajafimil.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/nigiwujoxepivo.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/sajotaganal.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/57802921283.pdfIn PDF document text
    • http://polletnv.be/uploads/files/94203753759.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/wulijibajebekawup.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/21946785455.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/dizeki.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/82268595536.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/16835218009.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/bezawuxejijoxegosi.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/jegomalalidasukazo.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/75796700465.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/dolosulekados.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0d4a66e7---lufewadegubupa.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/42941877479.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/80288056857.pdfIn PDF document text
    • http://fivelscope.net/fckimages/jewavukifeniberovixuveka.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/pukijaramijenofubok.pdfIn PDF document text
    • http://debten.net/UserFiles/File/36559320397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=avengers+4+endgame+full+movie+onlinePDF 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_off0000e39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39D 18600 bytes
SHA-256: 5867758cff21a0b811bf2cc3ae1642df8f03e1ec4d52ee2c483241cc76fcb267
font_01_sfnt_off00011465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7C 10824 bytes
SHA-256: 3d9777d38fc64886eff059e79878ac9a37769add66bf44d5c41fa10114acef6b

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