Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e73d99bdfe0e1bc…

MALICIOUS

PDF

83.8 KB Created: 2021-02-26 13:05:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dd258513c6600fca547dd1d8b6714be2 SHA-1: 30034c841421db2134c8998a0c2fb4596cd2bf36 SHA-256: 7e73d99bdfe0e1bc8035761ea286186e60d153515179ef91d86e8096f58aef13
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are part of a link farm hosted on disposable domains. The document body, though heavily obfuscated, suggests a lure related to 'Cantos de comunion para misa catolica con letra', likely a deceptive pretext to drive traffic to malicious or phishing sites.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://golowaki.ru/wix?keyword=cantos+de+comunion+para+misa+catolica+con+letra PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466675/normal_5fde11de4a5ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502511/normal_603532727cfa1.pdfIn PDF document text
    • http://choosenews.space/prestige_aps997e_wiring_diagramqt54b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425910/normal_602fc5ce1ed65.pdfIn PDF document text
    • http://detarekowopowub.22web.org/11038034261.pdfIn PDF document text
    • http://recepty-dd.info/printable_hangul_practice_sheetseqap7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477401/normal_5ff7748f5cc49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451756/normal_600cf060288fc.pdfIn PDF document text
    • http://famekeletiti.iblogger.org/sonoma_county_businesses_open.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464319/normal_6004cca8a3eb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470982/normal_6013c2ca6b8a5.pdfIn PDF document text
    • http://tetuzat.22web.org/vurule.pdfIn PDF document text
    • http://studyweb.site/old_school_runescape_grand_exchange_limitso8nzw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418583/normal_5fd7a81cce0ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462696/normal_601ec3b44e8e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379855/normal_6027b15a6a9ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412164/normal_60134b76f109b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468255/normal_602856471bde7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411503/normal_601b06697c655.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://walorute.rf.gd/adobe_acrobat_x1_standard_free.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_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 5124 bytes
SHA-256: 60b553fbdc9c455dd661266d505045edffe12f74379f709449f32095f6458f94
font_01_sfnt_off00010dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD8 16464 bytes
SHA-256: acf5a95253aede46f4e18d5e94fbfb9d7838d7268b697543167c4e4f82be3ffb

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