Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a95ca32fa5c251…

MALICIOUS

PDF

78.8 KB Created: 2021-03-12 11:09:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4aff449c577b2abb4d14065a123b764a SHA-1: 95d8a66bebe0840e2f54824d5344ffe83e1b5c4b SHA-256: b5a95ca32fa5c25188d7aef8d0c3dea6b7e801b7d8ba1ac9b43fb354844abc1e
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The primary URL, https://jottigo.ru/award?keyword=brahma+vaivarta+purana+pdf+english, appears to be a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/award?keyword=brahma+vaivarta+purana+pdf+english PDF link annotation
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/6e03f53b7e.pdfIn PDF document text
    • https://xovuxajewilim.weebly.com/uploads/1/3/0/7/130775567/2377593.pdfIn PDF document text
    • https://gozulisob.weebly.com/uploads/1/3/4/0/134012313/41faa7b8198b.pdfIn PDF document text
    • https://cdn.sqhk.co/banifiga/Tj7xSvd/cat_popcorn_smell.pdfIn PDF document text
    • https://remoruputudedux.weebly.com/uploads/1/3/4/0/134017090/3035571.pdfIn PDF document text
    • https://cdn.sqhk.co/vajirasavuz/j4ikDhf/magic_tap_tiles_piano_edm_music_games_2019.pdfIn PDF document text
    • https://zevamomarage.weebly.com/uploads/1/3/4/6/134611313/8494204.pdfIn PDF document text
    • https://mesikanuxiruk.weebly.com/uploads/1/3/1/6/131636832/mizokajuba-juluka-baxifolijaze.pdfIn PDF document text
    • https://jetezoxow.weebly.com/uploads/1/3/1/3/131379231/zituwi_gaxura.pdfIn PDF document text
    • https://nagenexam.weebly.com/uploads/1/3/0/7/130776307/19675a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7546efdf-a01e-4698-b054-78d5320554bc/excellence_in_business_communication_13e.pdfIn PDF document text
    • https://a2d2c786-a255-4d30-aaac-3df02bc54f47.filesusr.com/ugd/c345b0_f8479509abf044dfb8e619fcd668d89c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f04a312f-e6c2-4811-8bc0-e9cbd8c29a55/13466360262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e9d0c3c-f3bb-4322-a466-c11164b3cdef/soxiliw.pdfIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_1b797fddb87040edbe00ada9cbe22a4d.pdf?index=trueIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_ef6b98a7e0484e5688f7ee90404e0821.pdf?index=trueIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_9060951f060443a38e12ee69a2c29b9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4cfae50-6c62-4a4e-827b-5a1ba802fa77/accu-chek_aviva_test_strips_discount_card.pdfIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_8402f05845884b858cb8e10ad2941f81.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b9ead6c-7c0f-4ae5-8cf3-6074dd1cda50/jonebitugogero.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 5564 bytes
SHA-256: b4b62912f7e89763da8f3f9de679f91bdd714464e73a76ce336e3a30d17c84b4
font_01_sfnt_off00010b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B62 10132 bytes
SHA-256: 40d2f608fa1426c99bd56fbd8ef293913e580fde3fb9320cc4db1b01a7037594