Malicious PDF — malware analysis report

Static analysis result for SHA-256 508268dd96dc8fd2…

MALICIOUS

PDF

83.9 KB Created: 2021-03-15 22:27:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2650b20bb9c0769de0baea2283114282 SHA-1: 9d32e08d3686dc2fdcbd49415a3cb52ae01e13ff SHA-256: 508268dd96dc8fd2a62e589d0a3e55be2173b1076bbe1d1d901519095d3d5c45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. It contains numerous external links, including a primary link to 'dafemum.ru' disguised as a search result for 'Harry Potter books in order set'. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common technique for obfuscating malicious links or initiating redirects within PDFs, aligning with the T1059.007 technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=harry+potter+books+in+order+set
    • https://static.s123-cdn-static.com/uploads/4413109/normal_5fce0b660a8fe.pdf
    • https://cdn.sqhk.co/lanuniwa/wibTicw/69686606835.pdf
    • https://sedarujewajoto.weebly.com/uploads/1/3/0/9/130968957/c6ec7d0cf9ec0.pdf
    • https://cdn.sqhk.co/piredonina/b24ihhb/steam_table_software_free_download.pdf
    • https://static.s123-cdn-static.com/uploads/4425912/normal_5fc95e361c3c1.pdf
    • http://stroiline74.ru/vumufalemadogqire9.pdf
    • https://zesalogerevuj.weebly.com/uploads/1/3/4/6/134684883/31000de965c9d5.pdf
    • https://cdn.sqhk.co/vagizabibo/t4iaGih/my_smart_house_reviews.pdf
    • https://sijujufe.weebly.com/uploads/1/3/4/6/134696532/jegekejex.pdf
    • https://bazafegaxu.weebly.com/uploads/1/3/1/3/131383427/nunepigusimetevinom.pdf
    • https://tixatodaja.weebly.com/uploads/1/3/4/5/134507568/rometibog_zovavorenegu_darijosorafomar_ditoj.pdf
    • https://static.s123-cdn-static.com/uploads/4378425/normal_5ffb913a4cc76.pdf
    • https://cdn-cms.f-static.net/uploads/4381766/normal_604187dee3be8.pdf
    • http://badgesverified.com/xelegulixuvovonapipodexuwm12i.pdf
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/8735275.pdf
    • https://cdn-cms.f-static.net/uploads/4374522/normal_6040483eed01b.pdf
    • https://geliwesirodired.weebly.com/uploads/1/3/1/3/131382982/9820008.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/13edfa64-35b1-4011-a458-4aa00d712865/unity_technologies_stock_ipo.pdf
    • https://uploads.strikinglycdn.com/files/b4855000-4bb7-47cc-8624-10283b4289e2/31051642159.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ab.bin
b9ffca46f98ad67e2fa20a1e8d0b3f07c05c0d45fcc9af2afa790446e4387abc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AB 5188 bytes
font_01_sfnt_off00010459.bin
8afdfc7f335debdc5802849634b2d395721434dadec832ebc1cd6bbbd95662e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10459 11880 bytes
font_02_sfnt_off00012d09.bin
334a632046566dba1e13aa2ad28522ffc4701ff005b1d667d8ded0e84145bcf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D09 16304 bytes

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