Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f5b4c822eadc7d…

MALICIOUS

PDF

77.4 KB Created: 2021-03-09 12:12:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4411819ff9ee05567916bcec91ce798e SHA-1: 21361aeae23dc1c8a690ba01c5910b9ef187d5dc SHA-256: a8f5b4c822eadc7d91227af87d657a6332a742f4a9a120c0465566ba8f23cb9b
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 0.9996

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://kuzutuzo.ru/award?keyword=basic+english+language+skills+pdf PDF link annotation
    • https://cdn.sqhk.co/zozijawutuxu/ejh13gU/computer_launcher_8._11_mod_apk.pdfIn PDF document text
    • http://vifijes.22web.org/my_android_acer_tablet_wont_turn_on.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvetuzaxi/iamibig/fewawer.pdfIn PDF document text
    • https://cdn.sqhk.co/gepumenujeme/ohgjage/netflix_dvd_queue_sign_in.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502336/normal_603dd0db7eddb.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/djdijjc/zoom_cloud_meeting_zoom._us_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379219/normal_5ffcbd559d7a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_5fd333fd71663.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485822/normal_60071d148cdd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388406/normal_5fdb2ec8d951c.pdfIn PDF document text
    • http://tadekurujere.22web.org/adjective_of_quantity_list.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/iahaAjd/73358505161.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gapisoga.rf.gd/11829314729.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/cnet_google_chrome.pdfIn PDF document text
    • http://sodirubuget.epizy.com/jejaxarogojax.pdfIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_5273360132094c17a3efda2d215d9045.pdf?index=trueIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_84d3a4bd640f4bb28a1168613b682238.pdf?index=trueIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_f15c8cff73ce4813ac2560f9fd10bd20.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/watajive/62732310672.pdfIn PDF document text
    • http://riwekijeworore.rf.gd/82228438870.pdfIn PDF document text
    • http://derovis.rf.gd/fake_answering_machine_app.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 5436 bytes
SHA-256: eea7a8d8ab4b8083dba28776ef78d0c64f051cf155801a88ae4316cd6f7bf060
font_01_sfnt_off0001056c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056C 10292 bytes
SHA-256: 3d9d95f0b8a0bf17ab1d3d5f09630b15776fb478dd06ae9bcb8ceac1aa7f929f

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