Malicious PDF — malware analysis report

Static analysis result for SHA-256 df03c39cd69a92e5…

MALICIOUS

PDF

86.5 KB Created: 2021-03-08 04:32:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8909dcb4bf86f890745fc0690477aff1 SHA-1: 6d6d468259e3417297d1ba2a1cb26508f0eb33cd SHA-256: df03c39cd69a92e5d87047e3582ab97e8a369a6b6aa950a05fdf4e976a5cde3d
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 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/aws?utm_term=how+to+change+the+earpads+on+beats+solo+2 PDF link annotation
    • https://cdn.sqhk.co/noligigibar/e9gfujg/nazaginuluweleninewevo.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobita/tifvRhb/96377161906.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/hg0ieiU/depofijo.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/xYhhdkN/77880498088.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/hczhAji/merge_round_racers_2.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/aayFJii/zudinix.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/1ifhcoy/pac-_man_geo_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/Ehijhhc/46601657989.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/WNb5gJQ/26259872372.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/IhbKeid/kekojibemir.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/3uLrNww/vokosexipobiwasiwuno.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gobavaduxa.epizy.com/menschen_a1._1_answers.pdfIn PDF document text
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_346351175d784990a4e6b5898a7d6787.pdf?index=trueIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_64ed814427484263b9755e27600018b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/65d75bba-7948-4646-a2da-9d8fab978082/drawing_portraits_for_the_absolute_beginner.pdfIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_0d63f082e6f54864b8c1a3fe344f55a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/969afd85-03e7-4450-b751-5ab6c750128c/tawig.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_fc949417d423449ba10bb651f68e9172.pdf?index=trueIn PDF document text
    • http://xivoganunew.rf.gd/bribie_island_beach_fishing_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e466eec6-bdf5-4743-a4c4-53ab42698bee/vobivupodem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a23f0944-7d99-49ad-9618-2b379bf760f5/79444555112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cd745f4-ba66-4278-a5ea-a1dff6ec5ed6/49399442951.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 5660 bytes
SHA-256: bd424c38d4a356c24d2ffb60222088786b74beb93f88cc30c6b5f4950959c159
font_01_sfnt_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 2212 bytes
SHA-256: c11552f819352db998b71f269b26144d9d34073944b610192b6ad0fba9d0a266
font_02_sfnt_off00010efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFC 11440 bytes
SHA-256: 167dbe1f515707a371209b03045135ef7d03a6be3c29fc84d163859a57730e50
font_03_sfnt_off00013613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13613 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15