Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc215d20c2a8da9…

MALICIOUS

PDF

65.4 KB Created: 2021-02-23 13:03:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3565eac4b6186292b7fa06a2f3251e17 SHA-1: dc6a434b517b8a9a638fb116317a6cf8a2d305f7 SHA-256: bdc215d20c2a8da9f826bd62d35c76c1aff40ce9a71d70ca2f87c0d1a57ebaf8
136 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it's a phishing lure, specifically using an image to redirect users to a malicious URL. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL `https://jacksth.ru/strik?utm_term=how+to+replace+bulb+in+harbor+breeze+fan` is the primary indicator of compromise, likely leading to a phishing page or a second-stage payload.

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://jacksth.ru/strik?utm_term=how+to+replace+bulb+in+harbor+breeze+fan PDF link annotation
    • http://smilex.club/how_much_is_a_2014_jeep_grand_cherokee_worthcapi2.pdfIn PDF document text
    • http://marketop.club/how_to_hot_start_a_cirrus_sr22sakhi.pdfIn PDF document text
    • http://frukt.fun/army_mft_exam_2_answerseawzb.pdfIn PDF document text
    • http://top-odejda.com/5701572136002m47.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/dosalapasenow/6738448269.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/abs_plastic_sheet_bunnings.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/cancer_de_piel_dermatologia.pdfIn PDF document text
    • http://sozidimimu.rf.gd/apache_jmeter_ubuntu.pdfIn PDF document text
    • http://jiwepatifon.rf.gd/zanibonusapiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/dns66_block_ads_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/gokefigubamolomoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/5774710425.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/papawugefetuguno.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/classification_of_anaemia_according_to_who.pdfIn PDF document text
    • http://vutakeba.epizy.com/affinity_photo_for_ipad_manual.pdfIn PDF document text
    • http://wokofidikud.epizy.com/56870860303.pdfIn PDF document text
    • http://tukutuxobolekub.epizy.com/narrative_accomplishment_report_for_teachers.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_off0000c5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A8 5168 bytes
SHA-256: 2f70c2df9676ccbef9a28647398b17fa194479b201fce38775a7ada50389a628
font_01_sfnt_off0000d74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 9736 bytes
SHA-256: 977b1e5d9ca8818e7fbfb29247112de900e531e442019c8b61dee434a6456570

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