Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a014c8cfdf1904…

MALICIOUS

PDF

74.0 KB Created: 2021-03-13 15:52:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff9a353565038544e869505f6e989d1c SHA-1: 51ccacb2bd4a8232a8b2cdda1762f08b72465781 SHA-256: f1a014c8cfdf1904ec37d84c38208733c5778ffe7b0f1d11fd7aa5baf2f50ce5
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, forming a link farm, with the primary malicious URL being https://resalured.ru/award. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests a tactic to drive traffic to potentially malicious or spam-related websites. No scripts were extracted, but the PDF structure itself facilitates the malicious linking behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=algebra+math+worksheets+pdf
    • http://gejejasofubi.mywebcommunity.org/kogewogedawegeremowaneko.pdf
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/sidiwiba.pdf
    • http://rutekotugu.22web.org/billboard_top_100_hits_1988.pdf
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/fivelejixuvoba-sosedabo-rozix.pdf
    • https://rigivopamakor.weebly.com/uploads/1/3/4/8/134869382/60b22.pdf
    • http://kuwawaf.mypressonline.com/ielts_answer_sheet_writing_task_1.pdf
    • https://faniruwesil.weebly.com/uploads/1/3/5/9/135993686/fdae36aed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vebodunusugi.rf.gd/zirisomujonibakulugidajag.pdf
    • http://lajewureju.rf.gd/cartesian_coordinate_system_worksheets.pdf
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_d14b1bf52d024ce5b72c7bf142b8ed15.pdf?index=true
    • http://tikijot.epizy.com/6030278522.pdf
    • http://xavisijividefo.epizy.com/achieve_ielts_test_4_reading_answers.pdf
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_a88caa3ea07747d3b7bfdb808ca332ac.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b5446cad-cbbb-4957-ad10-3aa69e77a97e/cisco_dpc3825_firmware.pdf
    • https://uploads.strikinglycdn.com/files/e06ddc0c-1721-42a1-8c04-5d5c81deef2b/59616864945.pdf
    • http://liduvitulugug.onlinewebshop.net/tarizezavakif.pdf
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_c1804fa902c444528538850e4ca5a99d.pdf?index=true
    • http://vakizonozajaxe.onlinewebshop.net/craftsman_lawn_mower_parts_breakdown.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d75e.bin
1beabc2a3583d6339b05f454dfa94896d162e8ad55dd067affcb934085d37f1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD75E 5372 bytes
font_01_sfnt_off0000e9af.bin
da315d3bd60f286ef7c7ea6b04e5be46c763cbdc6438c2a1dc6b563daf55cb59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AF 10288 bytes
font_02_sfnt_off00010ce0.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE0 4324 bytes

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