Malicious PDF — malware analysis report

Static analysis result for SHA-256 4becbb2425a018d9…

MALICIOUS

PDF

71.6 KB Created: 2021-03-04 09:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5af333615e2ec3049eba3add54adc2f9 SHA-1: 50b2999a4020263bd43b82bc2a1e245da3fccf29 SHA-256: 4becbb2425a018d95d4d88ea8b170603b5403a0d3757e85e1c45c176aefb785c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one pointing to 'maypoin.ru', suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of embedded URLs and the PDF's classification as a 'link farm on disposable hosting' reinforce this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://maypoin.ru/award?keyword=how+do+i+take+ivy+cuttings PDF link annotation
    • https://cdn.sqhk.co/nogorodizet/cid6cQB/disaster_alert_japan.pdfIn PDF document text
    • http://profaudit32.ru/cisco_dta_271hd_blinking_greenno4a7.pdfIn PDF document text
    • https://cdn.sqhk.co/mazinatefoso/eSggLib/target_archery_scope_housing.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/qghwgcL/xuvujuvefukekigimo.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/lLhbjeC/gakodalefewibonejuma.pdfIn PDF document text
    • https://cdn.sqhk.co/pidenali/JfhjjcK/photos_apple_tv_app_download.pdfIn PDF document text
    • http://cardioactiveitalia.site/apple_app_store_for_android_apkgahiy.pdfIn PDF document text
    • http://boost-store.net/wipodexijunilu0iq0e.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/wisapiwewubopareniwab0bon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366993/normal_6029267e74465.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bokofapig/murufefelodelisigoveker.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/manchester_united_calendar_2018.pdfIn PDF document text
    • http://ponenerupugazu.epizy.com/70-740_exam_how_many_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/64720349641.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/the_escapists_xbox_one_crafting_guide.pdfIn PDF document text
    • http://joxumokuri.epizy.com/arduino._cc_free.pdfIn PDF document text
    • http://xifonefoje.epizy.com/40490000632.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_off0000dc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6D 5256 bytes
SHA-256: b6f64f1c008e2438689b7e06aebc53ce5c65b456581da6e884e939a1e2214f11
font_01_sfnt_off0000ee8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 10216 bytes
SHA-256: f41aa5cce65396000fd3165a683d794abcc7a259d51be29a993c4147978a9a26

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