Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f00cdab34867bbd…

MALICIOUS

PDF

79.5 KB Created: 2021-03-14 10:48:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 29189451dbcb986dbb8e992997eddb28 SHA-1: 3b8a0108d24219f4334f977d37bb962268dcdd5e SHA-256: 3f00cdab34867bbdf3f9c01e71e57086de997bd84f21f15bf4ad712f8c88aaf8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded URLs pointing to suspicious domains, including one that appears to be a link farm designed for SEO manipulation. The document body, though heavily obfuscated, suggests a lure related to resume samples, which is a common tactic for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/award?keyword=architect+resume+sample+pdf PDF link annotation
    • http://fudoviwil.mywebcommunity.org/how_to_calculate_the_pump_flow_rate.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380531/normal_5fed7df383c0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385410/normal_600c3c2b30ac7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481513/normal_602b6b2d25be5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426945/normal_6008622007f20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474723/normal_5fcb2afc5b058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450640/normal_603b3e3a3147a.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/whirlpool_cabrio_washer_error_codes_ul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477916/normal_60069b0f7ef29.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/80a55f2c-657c-48d2-adbe-6fa595452f61/is_oracle_18c_the_same_as_12c.pdfIn PDF document text
    • http://gevasonajudot.epizy.com/what_size_windshield_wipers_for_2014_nissan_sentra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d68a98-794e-4e3f-8da2-f9428212bdce/are_the_federal_rules_of_civil_procedure_a_statute.pdfIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/77914861223.pdfIn PDF document text
    • http://tenavugonotaj.rf.gd/xinelugutedafidebidifafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a3e105-3539-48ab-b0dc-5aa247df5cc8/how_to_connect_bluetooth_sony_wh-1000xm2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b588f5-5beb-45c0-8797-05eaa2a30e9d/comcast_remote_dvr_app.pdfIn PDF document text
    • http://lepugip.epizy.com/zerovo.pdfIn PDF document text
    • http://padusij.onlinewebshop.net/19260388081.pdfIn PDF document text
    • http://norezodo.rf.gd/74353062324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77ce1b77-1c61-4423-9268-e49ac4978ebf/31945456604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83675aef-8f24-4326-bceb-b3ff49439576/what_to_eat_on_keto_dr_berg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cede4421-adbd-4640-a37e-8ba7613a115e/jexununerowowojukewugul.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B4 3308 bytes
SHA-256: 5b40bfff84a63aba36884f1d2d9207c12ab816e84ec2665ae0d72fe407283651
font_01_sfnt_off0000e08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08B 5384 bytes
SHA-256: b0a162b0aa46ec5c046f8e4a0d839ac158fd20d7fa0fb8c4637587a1cd7a72e4
font_02_sfnt_off0000f2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 11744 bytes
SHA-256: b15845e96a00f39cb9cdc57ee7f13b970c0ad595a069641215422f14cc3123c0
font_03_sfnt_off00011b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 16084 bytes
SHA-256: 1513cff1140ee46b119fd1f1a8d89226c35fa745519edd36504e398b791a408b