Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1b07f2573396b0…

MALICIOUS

PDF

77.0 KB Created: 2021-03-25 07:28:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4bcdbee6fe24f7918a43a57e286b382b SHA-1: 11b892dbd464b89a8f4867103b3819d0d2a8cf6f SHA-256: 5d1b07f2573396b0952a8b22b10c46250682341b10773a69b78810765f01cde3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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=effect+of+temperature+on+diffusion+experiment PDF link annotation
    • https://cdn.sqhk.co/susojareb/BTge2ia/59568593308.pdfIn PDF document text
    • http://gomirakapo.22web.org/basic_principles_of_chess_strategy.pdfIn PDF document text
    • http://drilltech.info/48053744211joz9a.pdfIn PDF document text
    • http://vavoferidedodif.66ghz.com/alcalosis_metabolica_hipocloremica.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/zuxopufototeiorq6.pdfIn PDF document text
    • http://didavixakodix.22web.org/60519513131.pdfIn PDF document text
    • http://worldworkbook.com/wahl_cordless_magic_clip_clipper_black__gold_limited_edition4aw8x.pdfIn PDF document text
    • http://bezufosaga.iblogger.org/dizuti.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/hhKzT9O/the_labrant_fam_baby_boy_born.pdfIn PDF document text
    • http://all-system7.work/redofopimalorafizu7igha.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/030bc73e-669c-44aa-865c-1d98e63641cc/48940298395.pdfIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_45f10a20a42341d2914b64d12dc09abd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f2448bd-3ba1-4e87-a35b-3192d8153cbc/why_preparing_automatic_repair_windows_8.pdfIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_60479fab6b154ca29c353b346635e218.pdf?index=trueIn PDF document text
    • http://fudewalazakukug.epizy.com/citra_android_pokemon_rom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66812161-74a3-43e0-8c24-af4bad379e2b/39706311670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebf0f841-5b78-490c-8cd6-e8bd802317e8/ginovoxolejexaje.pdfIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_6c9874dc7bb446b39dec377655bc3d2e.pdf?index=trueIn PDF document text
    • http://votoromuw.epizy.com/algorithm_and_flowchart_in_c.pdfIn PDF document text
    • http://nilifejafajow.epizy.com/air_pollution_college_project.pdfIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_1b61113a491b4b9b999b45dfac29b71c.pdf?index=trueIn PDF document text
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_65fc42b27fda49bd9ceada43c33ac275.pdf?index=trueIn PDF document text
    • http://gabazozota.epizy.com/96565559155.pdfIn PDF document text
    • http://peworesafasar.epizy.com/xinigen.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_off0000eeb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB4 5292 bytes
SHA-256: 2eef5b29f2cc20d55be77492b55d10820722a2299f809d9143a9f432146f0e74
font_01_sfnt_off000100ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AB 11284 bytes
SHA-256: 49784c4181dc6929f53e91e1fbc9a9fa85c8eb8c23e03c7c9571e434e09654db