Malicious PDF — malware analysis report

Static analysis result for SHA-256 905463c653a2e17c…

MALICIOUS

PDF

92.7 KB Created: 2021-01-18 09:40:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f3d91456768af359d0533de25fcac4a2 SHA-1: ee1fd8ddd92eae0d304e9481e311b149956c7cbf SHA-256: 905463c653a2e17cb57a5511fcb47b4eb344b089ff5c6a86870145b108f603fe
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs, with at least one identified as a known malicious redirector. The file's structure and the presence of many links suggest it functions as a link farm or phishing lure, likely intended to redirect users to malicious websites. No scripts were extracted, but the PDF's nature points towards T1566.001 (Spearphishing Attachment) as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=beer%2527s+law+plot+to+find+concentration In PDF document text
    • https://cdn-cms.f-static.net/uploads/4464311/normal_5fe80cd178bf8.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/7hgcRfM/spiral_fracture_of_femur.pdfIn PDF document text
    • https://site-1178741.mozfiles.com/files/1178741/42040183756.pdfIn PDF document text
    • https://site-1173259.mozfiles.com/files/1173259/baumatic_induction_hob_user_manual.pdfIn PDF document text
    • https://zuberexuwaxif.weebly.com/uploads/1/3/4/5/134501439/2ca80ea9e43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391335/normal_5fed750e3b49e.pdfIn PDF document text
    • https://rusepokobedog.weebly.com/uploads/1/3/4/3/134366979/4091938.pdfIn PDF document text
    • https://site-1172122.mozfiles.com/files/1172122/42574150572.pdfIn PDF document text
    • http://tarenutufitox.66ghz.com/astronomy_magazine_september_2018.pdfIn PDF document text
    • https://jemeleromonojo.weebly.com/uploads/1/3/4/0/134041090/fududuxejofu-govugosak-fikegik-zikabotul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386622/normal_5fc6946d5ff1f.pdfIn PDF document text
    • https://neverazu.weebly.com/uploads/1/3/4/9/134901342/taziwulejadulujami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390663/normal_5f9895b6bb728.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/8VYhdDL/58791648242.pdfIn PDF document text
    • https://cdn.sqhk.co/bamikalagov/i2Cheie/english_malayalam_offline_dictionary_free_download_for_windows.pdfIn PDF document text
    • https://site-1177931.mozfiles.com/files/1177931/2016_olympics_track_and_field_100m.pdfIn PDF document text
    • https://site-1175190.mozfiles.com/files/1175190/miraculous_ladybug_amino_arabic.pdfIn PDF document text
    • https://site-1223352.mozfiles.com/files/1223352/definition_of_phonetics.pdfIn PDF document text
    • https://site-1177196.mozfiles.com/files/1177196/horizon_forbidden_west_ps5_console.pdfIn PDF document text
    • https://site-1254765.mozfiles.com/files/1254765/19682317286.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://raxusitusumulag.rf.gd/farmers_wife_quilt_templates.pdfIn PDF document text
    • http://legofovivaxom.epizy.com/manomivanebidesojesup.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C22 5112 bytes
SHA-256: ca08b3366990b6db3e8286082a4de148b9f873e18c039c3943435bf2cacda595
font_01_sfnt_off00012da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA9 12104 bytes
SHA-256: 46b2420d275a9156a96898d614cd6101042df279925a2187694dff6c4eae8196
font_02_sfnt_off000156e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E8 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230