Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b847317d7f6c75e…

MALICIOUS

PDF

74.8 KB Created: 2021-09-17 20:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e803f4bacb9112e4d613093b4f94bc06 SHA-1: d9377f5e5b858d6fb2859073b24e7928e5b3fc33 SHA-256: 1b847317d7f6c75ef49c7b95bcbed8bda8303b8dd96ac26b160b2a08468c7ec0
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs and is described as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The presence of multiple distinct hosts and UTM parameters in the URLs points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://queure.ru/uplcv?utm_term=lenore+edgar+allan+poe+pdf PDF link annotation
    • http://webinaris.training/ckfinder/userfiles/publics/files/kegugifuxeb.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090710514373499.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/pokafogok.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/16d7411e40af1060c68b86b904c4c08e/8964378042.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/vuwawa.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/lisawijoso.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/bakonibo.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/miwokamodawazetomatab.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/rorivamibamixupotex.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16311145080.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/22362080457.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/boxitivodavoxadupuzep.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea71c77bb9---vivonaximufasakifuligadis.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/nukomepubinanikoridefepo.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/b1c1fc9cbc454c807edd220307f4f67b/70994048812.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/vovom.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/74242959630.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/53614862342.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/19037678178.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/84727192815.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_off0000c0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 10272 bytes
SHA-256: da2fc12680baf9d8097c9054d90bb81d09c1a1eb9f3b4bece366f86bbd8e460a
font_02_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 17824 bytes
SHA-256: 31bdefde82b5192747996c2986b8e4f7fe90ec23ea8ebf5a4f0c0e39032bbeb6

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