Malicious PDF — malware analysis report

Static analysis result for SHA-256 bffd0a5179aa602b…

MALICIOUS

PDF

82.9 KB Created: 2021-09-21 22:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2127dac2b10e3d524bf359ac08607bca SHA-1: 96e7940d81e60193ce443fa73bb1ce41ea12342d SHA-256: bffd0a5179aa602bb5afb4998232371afbb3b6648e7cdc4c946ec7c31ce08dbe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URLs, many structured as link farms with UTM parameters, suggests a phishing or redirection attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=how+to+increase+battery+life+on+android+phones PDF link annotation
    • http://kapelski.pl/userfiles/file/tikidilogarujevujujet.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109010037176509.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/fudasitisilulixidi.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/vonilegosulorosemepevitej.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/temufanojibuzoni.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/denibeboparir.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/60668554394.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/sexenotixususomajuge.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/6491293295.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/75861295604.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/74155954474.pdfIn PDF document text
    • http://nemochem.cn/upload/files/zosusekutomudozunurolur.pdfIn PDF document text
    • https://campermagazine.tv/public/file/56071939560.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/39091690378.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210916225723.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/35380349490.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/favomabamugum.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395495b6d43---92209456060.pdfIn PDF document text
    • http://rvhifi.cz/files/file/74235092375.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/22608061189.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///81989745685.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/52152450773.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/palozokafurosiwiwavofe.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/49143973144.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_off0000dff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF3 11048 bytes
SHA-256: 193ff7ee9601c526facf712938874edde1c5f5c89a83754c84962ebeefa1c40b
font_01_sfnt_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001117f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117F 16904 bytes
SHA-256: 6912f8acb20ee76db9e33b15235b50023b79bd0beac3a788301b26edb7e6b87d