Malicious PDF — malware analysis report

Static analysis result for SHA-256 585d397d6b75f243…

MALICIOUS

PDF

83.4 KB Created: 2021-05-23 04:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 143ba0d1f280e1e989143b8eae9711e4 SHA-1: e0906ef300627378e3340482e83fcf90eb5ac0e5 SHA-256: 585d397d6b75f243e18ff64ca53b6042e96069cbd0e1a5fc9815e20734c94fdf
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains an embedded URI pointing to a suspicious domain, 'resalured.ru', which is likely used to host malicious content or phishing pages. The PDF structure itself appears to be malformed, with duplicate object definitions, suggesting it may be intentionally obfuscated or poorly generated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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/strik?utm_term=what+industries+use+child+labor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412999/normal_5fdb022d3a8f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_605a68fcae2dc.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/b45ac24a-9d89-4766-97f0-d2cd16e5181f/sikawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58190d51-a3e1-4017-810e-0d6786c83299/bissell_cleanview_pet_rewind_deluxe.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/31036626357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1e31fe2-5671-446e-bec7-1a4187dd8e07/zekovesut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42e9a231-7a31-4859-b2cd-17f6f4bc7034/why_are_the_lights_flashing_on_my_talk_talk_router.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56afb977-5571-4655-81f7-2629c451b3ab/schwinn_230_recumbent_bike_used.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e48f3e0b-74f1-4d7e-92a6-0dc33f491896/zatazukosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63bfb73b-d733-4bd2-9132-d04e1b1e8f83/mefaxiwarotonipamegip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dde44f4c-3ae7-46aa-a174-ed50ff0038d0/34702064743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/871cad78-0bcf-4cfb-8345-093207c5656a/xijafekoguvoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e2a172d-77c2-4b76-a35c-1dac996c4e94/kitanevobukavopilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159f6217-443f-498d-ad29-545ddbc1fe03/how_to_improve_your_marriage_without_talking_about_it_epub.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/podusoxezebefo.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/bevibipozuzeleram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64f1482d-dd1a-4b24-a47d-5d0b0f4ffe41/what_are_the_musical_instruments_of_singapore.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/xedizixivafodinonatew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed025fbc-b70e-4a85-a9d1-303cc4ffa6ec/fire_and_ice_robert_frost_criticism.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/7401399131.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/bufoxunijinorafapakum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5788570f-f8e5-46fa-ad7f-a79c74221467/epson_xp-424_black_ink_not_printing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/966f5f04-52e0-4e4d-9167-6b5ac7d136b2/beginner_writer_tips.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/adjectival_phrases_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/bhag_milkha_bhag_movie_songs_320kbps.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 5180 bytes
SHA-256: d5cca0e68d65972d908ccc04bf8084f98d013bc79c66609c853a356800f526c2
font_01_sfnt_off000118b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B6 11680 bytes
SHA-256: f2591a7be8e1e6d7a39e6402b59585b206fc8e54784565baf588f00e3bb0b180

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