Malicious PDF — malware analysis report

Static analysis result for SHA-256 b681bcc121b2f156…

MALICIOUS

PDF

73.5 KB Created: 2021-03-21 09:29:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3ebb65246ca8166d98cd4150c3c3e351 SHA-1: 7b7d2a73ff9713cd7dc37890feef58eca56d61f7 SHA-256: b681bcc121b2f156d986f25042cb61dfcdc9ce2880682ba16bd46221230a3f5f
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('maypoin.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests the document's purpose is to host a large number of links, potentially for SEO manipulation or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=sigma+alpha+pi+letters PDF link annotation
    • http://wupofifaxixusi.66ghz.com/fadujexinuxunutopikelip.pdfIn PDF document text
    • http://lapogomofirubu.22web.org/60948839375.pdfIn PDF document text
    • http://fukipinegu.22web.org/2511609922.pdfIn PDF document text
    • http://wamuterireted.iblogger.org/interview_questions_and_answers_for_medical_administrative_assistant.pdfIn PDF document text
    • http://wosojedawujemi.iblogger.org/wevuxefez.pdfIn PDF document text
    • http://kuvitexubo.iblogger.org/personal_computer_notes.pdfIn PDF document text
    • http://sovaxalute.22web.org/74159453731.pdfIn PDF document text
    • http://noxitafevinuv.22web.org/busqueda_activa_de_empleo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pisozirepuwi.epizy.com/9591234325.pdfIn PDF document text
    • http://kadegezopofog.rf.gd/idmss_lite_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1649ce38-f12d-4ebc-83d6-cdb844e0c151/fetax.pdfIn PDF document text
    • http://wesukaxibofawu.epizy.com/trumpet_voluntary_book.pdfIn PDF document text
    • http://fikupamipevow.rf.gd/19143315185.pdfIn PDF document text
    • http://relavidapozo.epizy.com/nursery_rhymes_video_free_for_mobile.pdfIn PDF document text
    • http://juromozupipoju.rf.gd/nexadunugebuzikimus.pdfIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_ebc7c2455cba4f95ace7d4f615d26330.pdf?index=trueIn PDF document text
    • http://xokopaxitake.rf.gd/gujajulanuv.pdfIn PDF document text
    • http://zijupoko.epizy.com/lg_refrigerator_customer_service_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6f9177a-0692-462f-8f9e-82f959903f20/budafiwotegowiwotalis.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_09258e658b26434e8e5965ec2616efe1.pdf?index=trueIn PDF document text
    • http://xalanijowule.rf.gd/fafobomanux.pdfIn PDF document text
    • http://mimiwuzoxul.epizy.com/81229198841.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_off0000df80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 5336 bytes
SHA-256: ad0b24268086757da8955701fe4fbfeddf6508c14da6202ae003190164747ef8
font_01_sfnt_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 11144 bytes
SHA-256: dcf48b68d4380cf93703e545f827be29176e0323698861b1ba5d0942e5359542

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