Malicious PDF — malware analysis report

Static analysis result for SHA-256 691ade2244722a9a…

MALICIOUS

PDF

61.5 KB Created: 2020-11-17 07:23:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: dd855c5eab4bc516186c62761d488c7b SHA-1: 42e48e95b050ab0d6e94e1990c9a010268009764 SHA-256: 691ade2244722a9aaa69ec2a2f8701a7bd7ebfb6db80384859cdf76893ab2d35
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=descarga+codechickenlib+2.5.2 PDF link annotation
    • https://guboriratuji.weebly.com/uploads/1/3/4/2/134235556/0a53fc.pdfIn PDF document text
    • https://zafitageleg.weebly.com/uploads/1/3/4/4/134489703/wetuxaxewajuludodosu.pdfIn PDF document text
    • https://fezojeme.weebly.com/uploads/1/3/4/6/134614855/tugiliwufidoxujoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e88f1c10-5009-4df5-971f-fe23e1f0fc9b/rilokudavobob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da3c19a9-0842-4301-9cfc-e3719edbcb01/25497127905.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/neuroblastoma_fisiopatologia.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/benvenuti_al_nord.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/vocabulary_words_for_ielts_writing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a662ad3-7be6-401a-8a21-104203e09cb8/xikumozokirufufamibemibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58f68691-c92b-4bf7-8eb5-da063305a17f/25159361284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a330daad-9146-4673-9752-10b1820dd2c7/letedegura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4fed3b0-0aef-4381-a071-5e99642fb408/burapiwaletudorezap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61c9cada-3c6b-44f6-a2b4-0b58bc30711a/noes_de_administrao_financeira_p.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/kotewirelafoziwikuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9641fe02-c352-4bb2-8f46-3263b3340169/31549752105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5797925-040a-4bfb-a5df-2362dd47fe46/23947210914.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_off0000af45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF45 5692 bytes
SHA-256: 8c6334077d4ab905d66eb7fd6e7298031268742907e56063ea1d07a7d8917bf7
font_01_sfnt_off0000c2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AC 12496 bytes
SHA-256: 8f0de415b0189a660964e535184f623b5a9190e9f5d5bd9853c72e094924831d

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