Malicious PDF — malware analysis report

Static analysis result for SHA-256 996616c61338ee29…

MALICIOUS

PDF

85.1 KB Created: 2021-03-14 17:12:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 226785891ff94e9d4584bf52d3248253 SHA-1: 5b51d78482f5d0015868f9f1a870dfd028def238 SHA-256: 996616c61338ee298fe02b4022fad52464d925764a988c578791d9ae85adae19
186 Risk Score

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 0.9994

Heuristics 6

  • 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 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://seumenha.ru/award?keyword=anti+typhoid+drugs+pdf PDF link annotation
    • http://xofelivigavas.mywebcommunity.org/key_marketing_concepts.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/16420231729.pdfIn PDF document text
    • https://revanesowokaw.weebly.com/uploads/1/3/4/6/134652238/mijuzuboniw.pdfIn PDF document text
    • https://tiwibuvemugijaj.weebly.com/uploads/1/3/0/7/130776889/77d7408f90e.pdfIn PDF document text
    • http://wijutomotagam.mypressonline.com/lanutuwil.pdfIn PDF document text
    • http://wigageturuv.mywebcommunity.org/2004_chevy_malibu_maxx_oil_type.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/74982492442.pdfIn PDF document text
    • https://gamevuwi.weebly.com/uploads/1/3/4/5/134525912/9750904.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/foucault_biopolitics_quotes.pdfIn PDF document text
    • http://gomesuzos.mypressonline.com/iata_dangerous_goods_regulations_dgr_61st_edition_2020.pdfIn PDF document text
    • http://tasigezagu.scienceontheweb.net/95895427055.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/8e21bbf4-cc4a-41dc-b7e2-5b11a734f725/adobe_photoshop_cs6_tutorial_for_beginners_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a2ecc71-e133-495e-b251-9ae53981822a/77524377097.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52402789-8511-4e92-9b93-33cf868679a7/samsung_hw-f355_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a3b8890-eec0-4c52-b6da-a5b074de23cf/the_cat_in_the_hat_book_awards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75b983e6-a01b-4deb-81ba-2ec15924ee15/power_acoustik_pd-931nb_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec32db12-a57c-4c93-9692-d5aa3fb14e1c/podam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81b90ade-f4eb-4848-8090-2e7faa97dd28/30178712978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f255e50b-e60b-4816-851c-cdb82036cde1/54281098244.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85b7aea1-fd15-4d86-b0c0-8de0c0ab9ece/limurudopowazifefew.pdfIn PDF document text
    • http://zeroxezubanalil.onlinewebshop.net/craftsman_radial_arm_saw_recall_video.pdfIn PDF document text
    • http://pizitibasowu.atwebpages.com/how_to_run_workshops_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d74567a-0e42-43d3-9f81-a152644a8937/rufizowiwetebi.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_off0001107f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107F 5152 bytes
SHA-256: c60e0fa7192a3b1f4ea669404501ff8252e0769358c6ff62b1b9a8d42200ad2a
font_01_sfnt_off00012211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12211 10716 bytes
SHA-256: 9b4486f2285470a8e109796856f8f40880101b51a5f89722ecdf193e31fc31be