Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8388f7dbf52a767…

MALICIOUS

PDF

76.7 KB Created: 2021-03-07 07:56:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fadce94843434d78102b899945928912 SHA-1: f9037cf90859e5596654d5c160899c77f8e26b1b SHA-256: c8388f7dbf52a7672ffad71bbec468f824ce5acfa2c37f04aabec52e50f088b0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://fokemale.ru/strik?utm_term=what+is+a+mass+haul+diagram', is flagged as unknown reputation and is likely the primary malicious destination. The presence of ClamAV detection and ML classification further supports its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://fokemale.ru/strik?utm_term=what+is+a+mass+haul+diagram PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427793/normal_5fe08ca2b8a50.pdfIn PDF document text
    • https://pedamajemekiju.weebly.com/uploads/1/3/1/3/131380885/533575.pdfIn PDF document text
    • https://niromegezos.weebly.com/uploads/1/3/2/6/132681660/fcc25ce8cc.pdfIn PDF document text
    • https://givodevivunafa.weebly.com/uploads/1/3/1/8/131871579/32cd3.pdfIn PDF document text
    • https://nolopatemima.weebly.com/uploads/1/3/4/5/134583633/zomajajaxanifogoxix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371497/normal_5ff7ba44caf70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473632/normal_5ffdd99cbc134.pdfIn PDF document text
    • http://clebohets.xyz/larson_calculus_textbook_answersd5jtd.pdfIn PDF document text
    • http://frukt.fun/ragenajefq8ffe.pdfIn PDF document text
    • http://solapp.xyz/liruropun97y9d.pdfIn PDF document text
    • https://kuvovoturuja.weebly.com/uploads/1/3/5/3/135322548/c92aa8048.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_877d5f1f8587468a8f79c5cde4d95ba3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/2017_vintage_report_beaujolais.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/what_is_the_movie_50_shades_darker_about.pdfIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_f140daa0f27f4b608fa471722ac60531.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/56528653177.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/40983953597.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/jamanununobaxejululaviw.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_41f4862e145b453da9c472656c1aa457.pdf?index=trueIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_60ef69d455fc4669b465eba4710bfc90.pdf?index=trueIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_9ce4d57138d8451cb249055d4d0886df.pdf?index=trueIn PDF document text
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_1608d3de22984ea6b70e2c3e2bab988c.pdf?index=trueIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_c35809b6b94d4dc2a80c8dcb69903199.pdf?index=trueIn 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_off0000f0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 5252 bytes
SHA-256: 6383597d948c82061b0aba63f9a131c51da0e430141687c7a76b4928601046a9
font_01_sfnt_off000102a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A9 10136 bytes
SHA-256: 916be5d96a412f2597e2800a22555639cecabce6e2474f55cee731749ac8f908

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