Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a3abbd556b4a23…

MALICIOUS

PDF

78.6 KB Created: 2021-03-17 17:02:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e061ac4509ee1b3c8dd717908ceb0901 SHA-1: cc1133d8203752a20259f0e774ab0281610fd2c3 SHA-256: 77a3abbd556b4a239f877844fbcc38313dd29ed12639317c8b5e8c3e83b2974e
136 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL that redirects to a suspicious domain, identified as a potential phishing lure. The presence of PDF-specific heuristics related to URI redirection further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://maypoin.ru/strik?utm_term=can+orange+juice+have+gluten PDF link annotation
    • http://tibetterrier.ru/likes_and_followers_on_instagram_apk23q0s.pdfIn PDF document text
    • http://plafond.xyz/2750370879015zdz.pdfIn PDF document text
    • http://fastnoutservice.ru/parents_as_partners_policy_early_yearsfmdke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/maxebasububebikizokiza.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/crystal_reports_trial_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/how_to_poach_eggs_using_an_egg_poacher.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/19461113281.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/vasant_panchami_2019_images.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/delonghi_fan_heater_hvs3032c_review.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/xereguzatego.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/sumawiruvonifedixegaxezeg.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/adventure_class_c_quest_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/nudexutegasume.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/atari_jaguar_roms.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/cnn_world_rugby_reporter.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/android_studio_deep_learning.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/xujowezu.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/latumedogowovojas.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/60385003088.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/sipupaxavorilutetijon.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_off0000f547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF547 4924 bytes
SHA-256: dae9abb941e331bab90d397b70d6136e58e65606088f1f54611c1dc84ac6dc12
font_01_sfnt_off0001060f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060F 11048 bytes
SHA-256: c93020fbc8ed9bcb3692e4b945cbfbd8260c1f579b60f7d23785883ba0f4d1b7

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