Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c0b24459e4265d8…

MALICIOUS

PDF

81.8 KB Created: 2021-03-31 19:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 71b502c33c13b0a6cb364dc75a91d612 SHA-1: 92235323febbfd28bf0f2d8528499b41a3eb2ea1 SHA-256: 3c0b24459e4265d888421f302140512383df25c30690a9558a445e00a8fca5aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9990

Heuristics 5

  • 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 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://resalured.ru/wix?keyword=surface+area+of+pyramids+and+cones+answer+key PDF link annotation
    • https://xemilesexevig.weebly.com/uploads/1/3/4/2/134266110/128373.pdfIn PDF document text
    • http://xitawefavam.medianewsonline.com/lafusabapipuxetubazavalu.pdfIn PDF document text
    • http://pusatokolerax.mywebcommunity.org/38486549979.pdfIn PDF document text
    • https://xuvivodoxanujo.weebly.com/uploads/1/3/5/3/135308848/7338761.pdfIn PDF document text
    • http://jepegupunu.mygamesonline.org/basketball_court_size_in_feet.pdfIn PDF document text
    • http://jovopomutulilo.medianewsonline.com/colostomy_care_procedure.pdfIn PDF document text
    • http://rabizepafuxonag.mypressonline.com/mazuropad.pdfIn PDF document text
    • https://xedasijaw.weebly.com/uploads/1/3/1/4/131453620/f5ae700c1.pdfIn PDF document text
    • https://bitilidejiv.weebly.com/uploads/1/3/4/4/134442737/6950637.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384325/normal_5fc62ef9b1195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447464/normal_600efa674bf45.pdfIn PDF document text
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/e52cc30.pdfIn PDF document text
    • http://fanuvazav.scienceontheweb.net/neoplasia_pulmonar_2020.pdfIn PDF document text
    • http://riniwodifole.medianewsonline.com/dejaxemajik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494433/normal_604b9c011b212.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/a137dd2c-41e4-4be8-b14f-b084846f92b0/java_8_jdk_download_for_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76ccdb5e-bfcf-4338-9167-9fd954e2aaa4/36066950676.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/coleman_5000_watt_generator_wheel_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/rofofepobafilaporawidef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c78eb5c-f974-49b7-81d9-2cba0c395dd3/18260039322.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/65662412125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9925868-66c9-4395-a41c-9b981a422d6d/death_from_above_airborne_motto.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/zirazomarutusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87c6cdc2-a32b-46f6-b1ae-7c3e1a2e1f93/do_all_dell_monitors_have_a_hdmi_port.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/capital_one_data_breach_claim_form.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 5628 bytes
SHA-256: 3b2ceee21cf62cea459310d013f41dd7e5418e4a0c9fc407ede26b98a406a9f3
font_01_sfnt_off0000fdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC0 10760 bytes
SHA-256: 0b046577f50db2cb27cca22b8150aa332200adb0f7881eb9c8675514ea4675bc
font_02_sfnt_off000122d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D9 16060 bytes
SHA-256: 2d958bd008b8db5b33092f112e99c856adbcc0a100e950d14ff814b784be6357