Malicious PDF — malware analysis report

Static analysis result for SHA-256 726f470fab7fce05…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 08:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cbfc375c687076bd8ab4e0786415ef92 SHA-1: 7f931b42319e44ddad6d54a28296c51732b9a939 SHA-256: 726f470fab7fce05c22aaced12a301a00d6cc2d9758d309fd251a1d2b2f22614
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to a link farm, with the primary PDF itself hosted on disposable domains. This suggests a phishing or malware distribution campaign, where the user is directed to a collection of potentially malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://alamansyria.com/userfiles/file/mumeropoveguxef.pdf In PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/juliwugezudaxujegug.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/600757277.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/75016879324.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/66705834704.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/24526299067.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/55204154967.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/39998288357.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/80196396702.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210901174411.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/4171154985.pdfIn PDF document text
    • http://runhouchem.com/upload/files/zifuwamoduxuf.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tetelolejupawo.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091123142220.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/7272614373.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/111450337824.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/22823421615.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/nonuganususovad.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/97531328934.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/damagolaporonuxuvijokapam.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/38049818072.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/kizivozawirotoxusonomuw.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/c4852dd0cf66ace286a5df84b0cbc85e/65790549406.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/relageluz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=call+recorder+pro+6.13+apkPDF 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_off0000d31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31A 10628 bytes
SHA-256: b1cea9953838e2f72f3cc6d4873804b209f0511525f518bc0a82fadcafedf33d
font_01_sfnt_off0000eb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 17784 bytes
SHA-256: 5fe9810aba6b570fae92bdc4d715fb608e94fdcd4aee2d2331fb385066c981f4

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