Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a63b9ee319e81b8…

MALICIOUS

PDF

70.8 KB Created: 2021-04-04 05:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d8d56ecd1575726585ccc0c0aaa166df SHA-1: 74e0e7633bcf3f2bf3c732ea8db1672f733443fa SHA-256: 4a63b9ee319e81b84401fd6e6e0de3bd20159a3fe4963734a761fc6cbddee3ec
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9991

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://zajinet.ru/wix?keyword=ati+nurse%2527s+touch+becoming+a+professional+nurse PDF link annotation
    • http://jonebukusopovet.mygamesonline.org/political_philosophy_of_john_locke_and_thomas_hobbes.pdfIn PDF document text
    • http://mofonuf.medianewsonline.com/comment_fusionner_page.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387581/normal_5fc732070cff4.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/521823857.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_6039812b4ac29.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/74a6fe03-1bf0-4c2d-948e-2fc60b5f592a/do_you_have_to_flip_meat_on_george_foreman_grill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/659b9340-09c8-4666-ac53-91573cb5d523/how_to_unlock_an_oven_door_ge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e048315-7a78-4de1-a329-72be056b1e53/little_fires_everywhere_synopsis_episode_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b12e78-a939-462f-ac11-5ab67b862244/color_a_course_in_mastering_the_art_of_mixing_colors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd4a80a9-9ebd-49de-b5c0-aeebddd49ad7/hayward_w3aqr15_aquarite_electronic_salt_chlorination_system_for_in-ground_pools.pdfIn PDF document text
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_0f83c9707a7743909cb30dca991fa6c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b03a23c-4a0b-44a1-8c35-057da8ec31ed/what_language_did_mary_queen_of_scots_speak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cfc7b30-541a-4683-b4c6-a28a70b0a4e2/85976859683.pdfIn PDF document text
    • http://nuwadolonopip.onlinewebshop.net/5504355150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4508cdbb-9c56-4d5a-a38c-7dfa8667492a/how_to_win_a_flush_in_poker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49dca9f8-6e63-4cfe-a9fb-08fa34e291fe/define_direct_and_indirect_band_gap.pdfIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_a371c8181a654daa844a076e28c8f0e4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fffa8ad1-62ed-4f71-a5d5-14978e322c48/west_bend_stir_crazy_replacement_parts.pdfIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_c6e536ef47bc4c4189929b5dd6c83fa9.pdf?index=trueIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_ab96fb42f5a24f4abb0d8e1af78a783b.pdf?index=trueIn PDF document text
    • http://safedoguno.onlinewebshop.net/things_not_seen_chapter_9_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c46f9b0-a5e1-4f9f-81ea-8d916ede7bb9/29140409465.pdfIn PDF document text
    • https://1d78cdce-0032-4a75-b9f1-030f6b068c24.filesusr.com/ugd/32f660_bea9d915f52f4009abc1063deea7c58e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03d4b9d6-88e9-41f5-a46b-80ad405fbf57/how_to_pair_mini_jambox.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_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 5592 bytes
SHA-256: 6ec75804de116722d657e197261a21eb2914e289622fa871ab303e0cb91e4c81
font_01_sfnt_off0000eac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC9 10224 bytes
SHA-256: e3dff58b4c879c01a8434274444573ea441ea5cd9ad18ba0f24649054c4c77ea

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