Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ae6cc3ac0d235b…

MALICIOUS

PDF

80.8 KB Created: 2021-03-10 06:43:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 55a79bff33a11b3853830ed1b299fcdd SHA-1: b218596e2ac39fd5ef468c066f4d66311c4aa8e6 SHA-256: b5ae6cc3ac0d235b0d933b1ab2b14f274332beb9d22363e5688e5c774762c1a3
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 0.9994

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://dafemum.ru/123?utm_term=c3+exponentials+and+logarithms+worksheet+a+answers PDF link annotation
    • http://svoydvalend.xyz/sonnet_29_george_santayanakum6x.pdfIn PDF document text
    • https://gupuvuzuguzi.weebly.com/uploads/1/3/1/3/131379578/bamidobewiju-kujatefej-kiwimiv.pdfIn PDF document text
    • http://tesocoin.online/will_there_be_a_third_season_of_dirk_gentlys_holistic_detective_agencyi68ki.pdfIn PDF document text
    • http://firstsecu-paypal.com/xebaw2sdgn.pdfIn PDF document text
    • http://itdiscount.pro/thanksgiving_reading_comprehension_worksheets_3rd_gradekjc7c.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/30624744806vz3pr.pdfIn PDF document text
    • http://salleapp.xyz/sezex9062v.pdfIn PDF document text
    • https://pesudimudoselu.weebly.com/uploads/1/3/2/6/132681392/jilemajelibuj-bejapebakokol-turaro.pdfIn PDF document text
    • http://onlyforyou.space/yamaha_htr-5740_6.1_channel_digital_home_theater_receiversyydf.pdfIn PDF document text
    • https://rebejudan.weebly.com/uploads/1/3/5/3/135316845/lurutawe.pdfIn PDF document text
    • http://tradestaroffice.com/7.3_powerstroke_service_truckgdcqv.pdfIn PDF document text
    • https://lakiromepokina.weebly.com/uploads/1/3/4/5/134589127/9f54483.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_1654701a3f8a4a4cbbaf7df47c802e1b.pdf?index=trueIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_6064014515204dd5a5cd407dde23f761.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bf19f21-d4ea-42ec-a591-a763e5986dbd/by_the_waters_of_babylon_stephen_vincent_benet_analysis.pdfIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_1042ada75aa643ae8dd761793e53424c.pdf?index=trueIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_bfde8887f5e84fde9cc68e0723d70a08.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/16b8abdf-626b-4a60-9299-dae64fba773c/sony_bravia_kdl-32ex700_-_32_led_tv_-_1080p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d61af81-893e-476f-a37b-d8ab122a8597/zafalumufegekitum.pdfIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_b9ec01f0f8834a8a86df7ce06d86d7f1.pdf?index=trueIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_2ca5fa7587414ce3ab1661e3a8dadd36.pdf?index=trueIn PDF document text
    • https://0108a07e-94d6-443d-bfa7-575dd38852ad.filesusr.com/ugd/756a01_5a6584b2146844f9b678080820646a0b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c43f85f7-ce03-4e7b-a30b-5dae3d7d61b3/trevor_noah_book_chapter_3_summary.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_off0000fa32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA32 5668 bytes
SHA-256: 6e65fb5a3eadee202f71d300caac04fa731762f23fa842580c192ed662a8fa70
font_01_sfnt_off00010d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D62 12360 bytes
SHA-256: 3f6bfd92352ac3bba41d13ae8d3bfd1c5ac82b6ef4ddc69f845e9561209d04cd