Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e12d8461d6b268…

MALICIOUS

PDF

78.8 KB Created: 2021-03-24 18:19:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 710ef565983e29227b0a5914df092e75 SHA-1: 5827a8c6b2e57b01218c755cead8a7111d677cb7 SHA-256: 33e12d8461d6b268562a770d7b576d3213917dfbce7119d36d4f13e7d4a12952
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 0.9991

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://crophysi.ru/123?utm_term=baby+status+video PDF link annotation
    • http://dilurijarejo.22web.org/darude_sandstorm_trumpet_sheet_music.pdfIn PDF document text
    • http://fuvisetitisenon.mypressonline.com/the_hounds_of_baskerville_summary_chapter_1.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/how_to_put_together_a_craftsman_shop_vac.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/simple_yoga_stretches_for_beginners_youtube.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/9b563f27-9ac8-4ca2-bff4-a66f66aca643/72961326013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92e0daaa-50cc-4114-bd61-130ac84dec33/95705728862.pdfIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_7a8f86fdd2d94ffcb528b0c1c0f6cf83.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fa788c9-137a-4285-9967-12d65ea3f243/sujudix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02300b1f-c60d-45d6-8ea9-482a3e8e1903/the_seven_sins_of_memory.pdfIn PDF document text
    • http://joxigonulalotip.rf.gd/adobe_premiere_pro_cs6_full_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/195140fc-d7a4-4c8c-9386-d8ca12d1e6d1/9973849235.pdfIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_816e464bf4fb45f5aeff2f80b1a47aaf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d79fce3-65da-4f2a-9729-49d6301fc1bf/legend_of_zelda_ocarina_of_time_master_quest_water_temple_walkthrough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2d982a3-17db-485e-9584-e5c30cb65488/jonupumekapulafudeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e9670c4-4aa7-4f8d-871e-22b8ac5c7cac/can_scoliosis_be_fixed_in_adults.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39a546c2-d549-4450-b8b1-34262d70fa90/kujonale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c78be078-1684-48da-8b29-28b7fe4f49e5/visual_basic_2017_express_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/130ae8ca-b7d6-4a6b-9084-ce8e685801b4/lafedotonuwamutew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5139fc3-954b-4ef9-b2cc-7d8222ed6569/how_to_program_sony_remote_to_control_directv.pdfIn PDF document text
    • https://bb209e34-24c3-4901-88bd-c00af8cda710.filesusr.com/ugd/de6798_0b20d6ec98b44b70a4de4a9b001fc914.pdf?index=trueIn PDF document text
    • https://e53c8fcc-339b-4d8f-83f6-44ddc8c6ace4.filesusr.com/ugd/1ea9c4_efce518c975d4f72bab3b8dd5e590ab6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/457f032d-af56-4a31-820e-39ae69b7a912/92400619238.pdfIn PDF document text
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_58bc51e4c1004e39b2f67108082c02c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7a149b5-6fbf-46df-bca7-2426c3db5b9d/57701730757.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_off0000f88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88A 5044 bytes
SHA-256: 44db19bed88bcff1de4a2251b46fa4ce6cd57f531f7549d247d9fc8793986467
font_01_sfnt_off000109cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CD 10492 bytes
SHA-256: d4716b364b82490bf2ac5797a18ac7a462401421c4c11e6e4e33b6f1bbd41f80