Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e3b8061dacda45…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 01:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2d739ac24edf207d41d55710cfb203b4 SHA-1: 4b19ac92ed61ff81dfafbe638f6411dad8838ada SHA-256: e2e3b8061dacda45669f6693c9b956e94b00d52060c3b7ef2e898dbacb3b808c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a phishing or malware distribution scheme, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://inwebjor.ru/uplcv?utm_term=mechanics+of+materials+9th+edition+solutions PDF link annotation
    • https://svltv.in/userfiles/files/51096051197.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/tofabepinozewuxegitaw.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/23433793969.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/15360487598.pdfIn PDF document text
    • http://edeins.com/userfiles/file/42733568739.pdfIn PDF document text
    • http://tchid.net/userfiles/file/18986045532.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613605a4143e3---vemugezodeke.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/12805162046.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/36138118151.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/dewuluw.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/64715032408.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/zulewetibutab.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/48692723260.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/jametuverizel.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/62556918905.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/70016271699.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/sakabirosoxoxapomomuz.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b497225e3---4836387701.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/bedamozuzukalojigagopok.pdfIn PDF document text
    • https://kawanmto.net/contents/files/28158907606.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/89634189878.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/kinujagutigekuxekobubulev.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/61326086866.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_off0000d727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD727 11000 bytes
SHA-256: 55522d1457b445db336c6c570debbd1015010766741aead13a10928cfb9ed75b
font_01_sfnt_off0000f08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08C 19620 bytes
SHA-256: e08ce54a10f57ba34cd9860a254bc595e05b36c54413cabb9ad0a69621835443
font_02_sfnt_off000124ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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