Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ec107ed2df9a87…

MALICIOUS

PDF

113.6 KB Created: 2021-03-18 18:54:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 232194355a5e9428ec310099a2c5446a SHA-1: b10f7f99b8e51fad13963752473f37303af02158 SHA-256: 49ec107ed2df9a876b6cede730017268f77b0591f1c0675a4e84383ce11f0efc
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 0.9997

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://baarspo.ru/123?utm_term=curious+case+of+benjamin+button+story+pdf PDF link annotation
    • https://pewituzusab.weebly.com/uploads/1/3/0/8/130874049/mewiv.pdfIn PDF document text
    • https://juguzitusiketi.weebly.com/uploads/1/3/4/3/134372303/zeribugezaturite.pdfIn PDF document text
    • https://renixopofofof.weebly.com/uploads/1/3/4/4/134486295/bojoxafotemegikilot.pdfIn PDF document text
    • https://ganokupojedozo.weebly.com/uploads/1/3/4/8/134890080/a4e3ac1696.pdfIn PDF document text
    • https://fuzewejobedogu.weebly.com/uploads/1/3/1/4/131482867/dubodubelunid_lotiwumegezage.pdfIn PDF document text
    • https://nakefofomiruni.weebly.com/uploads/1/3/4/4/134483242/vamewew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://notavopanugatog.epizy.com/accounting_standards_board.pdfIn PDF document text
    • http://nowesiredud.epizy.com/bibayari_bodo_song.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/download_software_for_kodak_esp_office_2150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e3e58e-bfba-46ab-943b-a3ecda83e0ae/22971285972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ac8771e-29df-4cd2-a267-b5124eb9e1f4/tupalemoxosofof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c41c808-dd89-41b3-8fe7-b624a2841a91/data_structures_and_algorithms_in_python_wiley.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4654cd3d-2fa4-42cc-8e0a-0301cc53426b/como_yo_te_amo_english_lyrics.pdfIn PDF document text
    • http://konapawejiwevin.epizy.com/how_rich_is_robert_kiyosaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5295ffa-a7a8-47a1-95ca-bfe63e497fc4/how_long_to_learn_aramaic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf92b2c0-9c3f-4e2f-98d0-c2a3fa9d3a96/roland_td4_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abd3ea1c-d646-43b4-a428-9d211a29722f/408399710.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/amazon_alexa_apk_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/music_license_agreement_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07e0ad68-f61c-4d87-b2c5-b8aefee59aec/constitution_of_the_communist_party_of_the_soviet_union.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/the_millennium_development_goals_report_2015_philippines.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_off0001818f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1818F 5492 bytes
SHA-256: 8fff16d1ccc35f18cb18a131f9181b9a916d208e6b94c2feba0fa2fba9ec18aa
font_01_sfnt_off0001942f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1942F 10764 bytes
SHA-256: a66aa75ec464575874d9886dab1501a1bdfec2c07522671684a2bb1ea8a86000