Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78dc1053d9681e1…

MALICIOUS

PDF

100.8 KB Created: 2021-03-16 07:17:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7edcbff6bdba207fcbc9ae5a7d56f9ef SHA-1: b8e52c7ba0a2e4d4af3827d182e0fadcc77ace63 SHA-256: f78dc1053d9681e159fd96013b39b0b3a887c90a32d571472c51d7c13d346b9d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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://lozipotod.ru/aws?utm_term=what+is+riyad+us+saliheen PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401723/normal_60145b5a1c7cb.pdfIn PDF document text
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/zarololidoxikurel.pdfIn PDF document text
    • https://junafoxotoroj.weebly.com/uploads/1/3/0/7/130738975/e8d22d1055b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485695/normal_603f91908f603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421970/normal_601122e1d48ae.pdfIn PDF document text
    • https://jupisururixed.weebly.com/uploads/1/3/4/3/134339091/57f29be73.pdfIn PDF document text
    • https://gogesatita.weebly.com/uploads/1/3/4/3/134321397/70b0f99491acd9f.pdfIn PDF document text
    • http://hermidkovo.info/vision_based_autonomous_robot_navigationed4dp.pdfIn PDF document text
    • http://brumbum6.xyz/hockey_calgary_game_sheetsauu3r.pdfIn PDF document text
    • http://znasila.ru/31541706416z37xf.pdfIn PDF document text
    • http://topcreditmonitoring.info/sony_ericsson_mw600_battery_changeebybk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_ee5c28490ba244068970fe4a72b6b2f9.pdf?index=trueIn PDF document text
    • https://40052bae-d6b0-4be3-9c84-96956a804c69.filesusr.com/ugd/32907c_6ccd44d31f494037b68e7facd6e1411d.pdf?index=trueIn PDF document text
    • http://rodedewezijore.atwebpages.com/dantes_divine_comedy_summary_sparknotes.pdfIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_e62a6790216f4e4d9865546dec6b89d5.pdf?index=trueIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_2cab4338ac034d8faa7b6d41d3861610.pdf?index=trueIn PDF document text
    • http://xomutojekes.myartsonline.com/when_do_you_wear_your_military_uniform.pdfIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_b5cfd9a8e2ca467f85a9680d37019ff7.pdf?index=trueIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_a9e5fd9ba11543fe9d9c7fed292b2ec9.pdf?index=trueIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014b9f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14B9F 25052 bytes
SHA-256: c5b6df070616c0d4bf159092a9fb4d528e35462493925bb47acd82452da76505
font_00_sfnt_off00011475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11475 4800 bytes
SHA-256: 3274993670650077bf16ad46b355757eb6867e83750ac8ee79ccf15ec0d4a937
font_01_sfnt_off000124b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B7 12008 bytes
SHA-256: 6c9757857b2e2273e2711f0cc3b46ce2b9098c135b77963587e2a5f41648481e
font_03_sfnt_off0001779f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1779F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e