Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a3fbc4f4b5af0d…

MALICIOUS

PDF

117.7 KB Created: 2021-04-03 06:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f6942a42b0d6cfbbf5dc84f47043b71d SHA-1: e95e32688f2b336945f50571dc606a5a7f7ea541 SHA-256: 55a3fbc4f4b5af0d4c7134af424697bd6483f74c57ab372106abd836f62c82fb
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 0.9934

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://dugedepap.ru/wix?keyword=mark+levin+books PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408009/normal_5ffa42adb9f15.pdfIn PDF document text
    • http://nat-yoga.space/telescopic_alidade33u0x.pdfIn PDF document text
    • http://unlockdeals.shop/tudufewofc0nd1.pdfIn PDF document text
    • http://alkim.xyz/zufanofewebebulanegetapego4ry.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_6018f8de3bc5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489977/normal_6031779c3e871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444115/normal_601fd45780acc.pdfIn PDF document text
    • http://imedo.ru/dewalt_20v_drill_driver_combo_kitzv229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389354/normal_603f5d560fc41.pdfIn PDF document text
    • http://2020coupons.info/gufiwnqiyh.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://s3.amazonaws.com/luropi/web_development_course_outline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/157ac805-6e72-4d61-bd3b-4d10d010a49e/18017714988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be4aa417-1984-4b3e-960d-b8670f8ca32f/63288303543.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/use_css_in_django_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0250ebb0-9bf1-4493-ad10-e79a06a1531b/nazape.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/3ds_max_2011_crack_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/037719b4-d3a9-4df3-9b7f-c873a1032bda/how_do_you_write_an_introduction_for_a_research_paper.pdfIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_51784385fdf342f5bb3d229f478b415e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1cb1aee-4256-422b-975a-49fcf014aff3/65392057813.pdfIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_487bcedc27614a988718856d22270114.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/caruso_lara_fabian_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b935ef3-3d1f-4121-bbe5-1b98d647d154/xowodalibegitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03c82a7b-b0f6-449f-a369-c85c92f56b9b/possessive_pronouns_exercises_for_beginners_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08f9175d-c865-43d9-95c9-98993c581542/producer_examples_science.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ad402a6-87d4-4466-b057-4247d64dc9f7/jbl_sb400_no_sound_from_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2250aabd-b499-45c6-a9ff-6f32ca7a8e5f/do_gravity_boots_make_you_taller.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18197 4656 bytes
SHA-256: 995fa7791bcc47c991593c4f7c7d5f54b60029cb64e030815980038a1e77196a
font_01_sfnt_off0001916e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1916E 11960 bytes
SHA-256: c0736086d0bf80664bfbb8aee4282d0bbe28c50f0e6dec33f22da2d3621cfc59
font_02_sfnt_off0001ba4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA4D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176