Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4a58229714e1e3…

MALICIOUS

PDF

86.0 KB Created: 2021-09-18 17:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 431fe25ad3d89baa05e87a4258365f65 SHA-1: bef4f8916d1bf3cd8e8b1475ff61c6d075afa021 SHA-256: 8a4a58229714e1e33eb052f2080a33a9b8e9c5bc19c8eeaf894ce0d8ae200444
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external URIs, with one specifically pointing to a URL containing 's8+launcher+apk', suggesting a lure for potentially malicious software. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for a large number of links, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=s8+launcher+apk PDF link annotation
    • https://khonggiansachhanoi.vn/uploads/files/21973274209.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0d32adfd1---vonufapifatiru.pdfIn PDF document text
    • http://byecook.com/ckupload/files/wufitopupemawibimiru.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/lasejivovoxonemokuz.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/97845063616.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/70739399597.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/dowifenunakusene.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/65619721192.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/goxazofoxavanenezilobeto.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/6654975351.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/tubavudopufadelunodedebu.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/zoxudipijikezuwabu.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/lovimisukipazowusovidujer.pdfIn PDF document text
    • http://atya.eu/files/file/nabimuzujuwifivejabog.pdfIn PDF document text
    • https://securitydm.com/slicice/file/fijodel.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210912125640.pdfIn PDF document text
    • http://xiao-bao.com/uploadfiles/fckeditor/20210902/file/16305976714033.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/21600341836.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/badewodujopin.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/42218977391.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/79416040475.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/66739281516.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/bajoxizezupanutofupogam.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_off0000ed42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED42 17844 bytes
SHA-256: 2a4140db0bdd40dbd0233c0021858c6b7936e9a195cae11b0bffa77d62cced76
font_01_sfnt_off00011b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B59 10468 bytes
SHA-256: 1eaf09dfcb1b63262b7c2f4da3fd7c847665146897941d4c2a09e69575b1b9d0
font_02_sfnt_off00013312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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