Malicious PDF — malware analysis report

Static analysis result for SHA-256 743b7553643634ee…

MALICIOUS

PDF

77.4 KB Created: 2021-05-29 09:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 64ac785a5717f3d6ccf4313d282ac906 SHA-1: 9f4a842693fb0e03ab8f053ef6ef17f5ea3b80b7 SHA-256: 743b7553643634eeb08fc26418a2927a49a37672d03ef9e070bed948a6739897
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, including one that appears to be a phishing lure related to appliance parts. The PDF structure and embedded links suggest it is designed to distribute further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/strik?utm_term=fisher+and+paykel+fridge+spare+parts+melbourne PDF link annotation
    • https://kukezuleji.weebly.com/uploads/1/3/4/3/134361302/74fb6.pdfIn PDF document text
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/6371762.pdfIn PDF document text
    • https://sixisamut.weebly.com/uploads/1/3/5/3/135308299/2109415.pdfIn PDF document text
    • https://fevebelok.weebly.com/uploads/1/3/4/0/134012800/23967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387715/normal_5fd831af0f3c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393189/normal_6014b65e9789c.pdfIn PDF document text
    • https://nedixizudunosil.weebly.com/uploads/1/3/1/4/131483200/c1745f.pdfIn PDF document text
    • https://mogoxolokelitaf.weebly.com/uploads/1/3/4/6/134645696/d0fc8f3b.pdfIn PDF document text
    • https://lomelamul.weebly.com/uploads/1/3/5/9/135994015/jilumuwefemakagu.pdfIn PDF document text
    • https://kafigibedup.weebly.com/uploads/1/3/4/4/134479504/12a3a2b06ba5ea0.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/jasufedurirago_darabuvex_fazot_fodoz.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
    • https://uploads.strikinglycdn.com/files/2ee71545-f613-46f6-9528-8c6332567473/casio_f-91w_alarm_symbols.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ef944c0-129f-44d8-b91b-35dc953a1844/60374569118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/997cb0c2-ada6-403f-aeca-33e05fc4e109/pampered_chef_double_burner_grill_pan_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24e5aedb-d31c-4dac-adc6-ce2fbf23e31a/xonufubirobidid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/674b0443-154c-4f05-a56c-1aa3292f8b3d/4_pics_1_word_level_215_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df7d1b75-5bbb-4d99-9f89-c4f3da48c595/why_my_note_3_battery_drain_so_fast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1030315-2468-44ab-93f9-5429ec9da5e3/mujakigafebazepis.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_off0000e30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30C 5600 bytes
SHA-256: 4a708945f78830e87a6d1263e31a59f18175d1553d8c10dd05ebe1cab1b4200e
font_01_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 10556 bytes
SHA-256: 8f29326c5f42b21921b61bbc5c2c4925fed73defa32118cda4903c1f199de8cf
font_02_sfnt_off000119da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DA 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3