Malicious PDF — malware analysis report

Static analysis result for SHA-256 22354739ca6ace83…

MALICIOUS

PDF

85.3 KB Created: 2021-02-27 09:46:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: fc78bd0a4b724b8372c2253e8aaa62dc SHA-1: 4c341edcb0577ff7235d2fbfc4f1594bb1ce4b71 SHA-256: 22354739ca6ace83f2b77d9d3479c5f349a0a800b529b448b30128aff93f9176
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable hosting services. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious payloads. ClamAV and ML classifiers strongly indicate maliciousness, and the presence of numerous external links suggests a potential for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/aws?utm_term=how+to+unclog+a+dirt+devil+vacuum+cleaner PDF link annotation
    • https://lowunipuso.weebly.com/uploads/1/3/1/4/131453219/zozal_tenejav.pdfIn PDF document text
    • http://brumbum3.xyz/bionaire_ceramic_tower_heaterjgleg.pdfIn PDF document text
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/pulofisanokukivafer.pdfIn PDF document text
    • http://trendmobile.ru/7820832671oz1ja.pdfIn PDF document text
    • http://lg-supportteam.com/33844867871n7lm7.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/cvgh2a4/down_the_hill_podcast_review.pdfIn PDF document text
    • https://feposogasutam.weebly.com/uploads/1/3/1/3/131384530/6ca28c5.pdfIn PDF document text
    • https://folenepawesig.weebly.com/uploads/1/3/2/6/132680852/7111a55408c.pdfIn PDF document text
    • https://kelesive.weebly.com/uploads/1/3/0/8/130874426/giluwik.pdfIn PDF document text
    • https://tekudijasefemo.weebly.com/uploads/1/3/2/7/132740256/kuvezusivusiro-vepagusorok-jebunasegofug-fedabisamoni.pdfIn PDF document text
    • https://zupevojug.weebly.com/uploads/1/3/0/7/130740492/9797530.pdfIn PDF document text
    • http://vk-settings-change.online/how_to_manage_your_time_wisely_as_a_student7yb6i.pdfIn PDF document text
    • http://vquest.website/fikuxijowevufinuzasefilimklrp.pdfIn PDF document text
    • http://akvatehnika74.ru/how_ionic_bonds_hold_atoms_togethermlyar.pdfIn PDF document text
    • https://wanomumopanud.weebly.com/uploads/1/3/1/3/131379193/4401069.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/bjjXhhI/shareit_apk_download_for_ios.pdfIn PDF document text
    • http://daliadiago.com/countersnipe_mod_apkokuy7.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/givifxE/i_remember_lyrics_damien_rice_meaning.pdfIn PDF document text
    • https://wofexajolevesi.weebly.com/uploads/1/3/5/3/135302186/5474170.pdfIn PDF document text
    • https://tupirusu.weebly.com/uploads/1/3/4/7/134702138/fozibawibuzu.pdfIn PDF document text
    • http://trylait.club/529064118381j62g.pdfIn PDF document text
    • https://cdn.sqhk.co/sewetotab/jdxq1oj/toy_story_drop_cheats_scene_3_level_51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001115a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115A 5192 bytes
SHA-256: 56935b82a947b1bb687e71f43536ce774e7e36e3379d7fe9af1172d97e820ff2
font_01_sfnt_off00012309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12309 10660 bytes
SHA-256: 2594c7ed357d75f4e4314c71a174e22e1d2342fac7d9ef174be446229dd4b20b