Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81ef9c391deb75c…

MALICIOUS

PDF

78.1 KB Created: 2021-05-07 09:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c5afa0d3e0e93adb0a37fd8494fabc04 SHA-1: 95c0a15f929b33db37e58b0ea2b6433a9623e6cb SHA-256: a81ef9c391deb75c04a1cf69fa46208681db2d56aa76212bd6925638d0c8f0b2
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL leading to a suspicious domain. Heuristics indicate the presence of external URIs and a high ML score for maliciousness, further confirmed by ClamAV detection as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, suggests a lure related to 'activity 1.1 2 simple machines practice problems answer key', aiming to trick users into visiting the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://soxebez.ru/strik?utm_term=activity+1.1+2+simple+machines+practice+problems+answer+key PDF link annotation
    • http://amin-ukraine.net/led_zeppelin_bootleg_sitesijh3a.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/microsoft_word_2007_keyboard_shortcuts_not_working.pdfIn PDF document text
    • http://vitalia-transports.com/752340407141gxba.pdfIn PDF document text
    • http://nujijaj.getenjoyment.net/the_expanse_season_4_episode_1_review_den_of_geek.pdfIn PDF document text
    • http://dezowem.medianewsonline.com/kanigizes.pdfIn PDF document text
    • https://solupufaposedi.weebly.com/uploads/1/3/1/8/131857421/2307a.pdfIn PDF document text
    • http://tcerkovniekupola.space/102983627449434r.pdfIn PDF document text
    • https://modibidusez.weebly.com/uploads/1/3/4/0/134096811/mujoki.pdfIn PDF document text
    • http://shop-onlain.fun/resume_template_singapore_20192wuvn.pdfIn PDF document text
    • https://dikodaselafilug.weebly.com/uploads/1/3/4/1/134108642/4d05faba.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://latitekiwa.scienceontheweb.net/94350714790.pdfIn PDF document text
    • http://todayit.pro/bolowesemejituwasur4u4rt.pdfIn PDF document text
    • http://modozadubop.mywebcommunity.org/what_are_the_rules_of_sentence_structure.pdfIn PDF document text
    • https://dizabulis.weebly.com/uploads/1/3/4/5/134524464/4819837.pdfIn PDF document text
    • http://medtechnika1.ru/how_many_countries_touch_tropic_of_cancerqybck.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wozitoso.atwebpages.com/vuvuveju.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/86960803269.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/49236108751.pdfIn PDF document text
    • http://bitenozof.atwebpages.com/magic_chef_refrigerator_thermostat_repair.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/navijokon.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/raisin_in_the_sun_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/baromojivafiwises.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_off0000f2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 5836 bytes
SHA-256: 6254e119928a2da333d8d50d897c7e181e8580505f0f41431345d70cf2341f33
font_01_sfnt_off000106d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 10444 bytes
SHA-256: b00a1d8748c010bb603cc60d747b02462001ce539c1022fa91b3bcd029bf333b

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