Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaec0cd809eda386…

MALICIOUS

PDF

75.3 KB Created: 2021-09-18 11:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 3cfebdc8cb42b61bfef399e56a29ef84 SHA-1: 93077b0d973e2c3428f99dd9cd1b7bc2fe01702b SHA-256: aaec0cd809eda3861c93c3e5ba772d200a60dd2e46760ac4fd30f6851b6701d0
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=unblocked+moto+x3m PDF link annotation
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/30674adf3510b8fc9f5f6efeffab3ed5/tetemusitiborafik.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/32619849523.pdfIn PDF document text
    • http://autovoda.ru/upload/files/41782340235.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/70518426933.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/90051185294.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/zuwusizisizawitimaxorufup.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210903054720.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/91004607604.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/55379804114.pdfIn PDF document text
    • https://bevillelecomte.com/ckfinder/userfiles/files/68558978203.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1442076918613300488f6c1.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/lipoluxi.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219121637526768.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/55503009000.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/md9nhhqa5g8mlmp68eas41qcrc/73985070669.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/jomipivimovadivogip.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/jizonataredika.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/1108164339.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/wegusuja.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/wunadipebovep.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/13165112666.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/12316514722.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2109170455092972196es5l8ozchg3.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/jofafopirojenuremamol.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/64456519056.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_off0000c445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC445 16824 bytes
SHA-256: c2ef9a1315b213967dd1341873a8067f31b85d9b711c02cd165f3f98e9fcf652
font_01_sfnt_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 10520 bytes
SHA-256: 834e57519eaf69b4a1f3d7f55d77689573f665c8d882b30e0e777ebf4d806f0b
font_02_sfnt_off0001077d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1