Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62f4f0357688f52…

MALICIOUS

PDF

76.9 KB Created: 2021-03-07 08:34:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e381ead042d6c46e57a2f5726bc62a7b SHA-1: 7f50b08814a462755d48b92980974d8636961a5b SHA-256: a62f4f0357688f52b237eecfb9732e030852fcb92287e9149e920028fb852391
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for a large number of external links, suggesting a link farm or redirection scheme. One of the external links points to a PDF hosted on AWS S3, which is likely part of this scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/strik?utm_term=strymon+deco+used+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450639/normal_602409d19b0d1.pdfIn PDF document text
    • https://mepiguresibano.weebly.com/uploads/1/3/4/3/134352921/zipof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384167/normal_603cbb029c020.pdfIn PDF document text
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/rotiruwova-garizusizipal-tamekuxekot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413002/normal_5fd379a79463c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462678/normal_5fc94e7f6d6e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_601b02b13e84e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_5fd6746e19933.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/gedexim/bisulefaxi.pdfIn PDF document text
    • http://tetokimofomimiv.rf.gd/mdr-zx770bn_pairing_with_iphone.pdfIn PDF document text
    • http://xenilesaripesu.epizy.com/93851204864.pdfIn PDF document text
    • http://buvekopap.epizy.com/rasukoligadul.pdfIn PDF document text
    • http://pejonoma.epizy.com/12914216073.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/logo_quiz_games_answers_level_4.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/crown_muriatic_acid_msds_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/duwuwuvikajuso.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/craftsman_garage_door_opener_not_working_keypad.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/33041834887.pdfIn PDF document text
    • http://zefixufedinokas.epizy.com/mugibuzutokofajebu.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/vasotec_davis.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_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 5372 bytes
SHA-256: 818aad66b37f9e616a245d9e2a934882deda24b11ab1d2d57578f0f4e0894678
font_01_sfnt_off0001004a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004A 11016 bytes
SHA-256: 94402f6675deee23a22f5d73f83df33875a69a483c53601b8c4df0694a1dba01

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