Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab488998643ad475…

MALICIOUS

PDF

86.8 KB Created: 2021-09-14 14:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 86e3790e51ccdb35d5d3fbb03724546e SHA-1: 4543ee031539674e9c1a6792c4d36bbe61acddf7 SHA-256: ab488998643ad475de93cf91ab467a17a3643c9fc6b03e10145e1498995495a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The presence of multiple disposable link farms suggests an effort to obscure the ultimate destination of the malicious links. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://coretry.ru/uplcv?utm_term=i+lost+my+android PDF link annotation
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/13031139669.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/kazijevigeposije.pdfIn PDF document text
    • http://palami.by/images/file/83522950613.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/47427995569.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/19379968843.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/26487442931.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613041c94031f---nutef.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/67460945035.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210908142904.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/35307718249.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/rogexazunizazi.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/99646628043.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/vutipu.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/tagoviga.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/watusazanoxi.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210913205042.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/21562644573.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/pilebupefaloxo.pdfIn PDF document text
    • http://njchemland.com/upload/files/guvowubavez.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/wolotexewoleletiz.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/xebujamakiw.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/fubugalifinadikudefufibub.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/xexatatubukexavowe.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/62147916203.pdfIn PDF document text
    • http://timocomputer.cz/files/file/tifirig.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A8 10344 bytes
SHA-256: 8fba115894ed3bea6d59699d520bde6c9d838f8f7c72a0c2598dbf29a76ca807
font_01_sfnt_off0000ecf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 17232 bytes
SHA-256: e5e7ac642b69dce28acb5b6fb72176cf65a62cd3fc5f566806881adf4956d8f3
font_02_sfnt_off000106d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE2 18416 bytes
SHA-256: 7c304448c5feebf78a1124865a4d08f910ae78a967bede7a7a8b93c218a20d99