Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5f1b7add3f8c48…

MALICIOUS

PDF

61.3 KB Created: 2021-01-12 00:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 48c5d516ad9e432100d64b2acef0086b SHA-1: 2235be28733520da259bf5eaa2472a07e8286e5b SHA-256: de5f1b7add3f8c48231fbf4fdab675184c196bbbb35f221172cc7a69725bb8b2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a link farm and ClamAV detection as a phishing trojan. The embedded URLs and the presence of a large number of external links suggest an attempt to redirect users to malicious sites or to manipulate search engine results. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/aws?utm_term=cambridge+english+advanced+2+with+answers+pdf PDF link annotation
    • https://site-1226757.mozfiles.com/files/1226757/olympus_camedia_c_4000_zoom_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/e6jejhI/xomuvovekurofigaro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490515/normal_5ffa392d2f6e8.pdfIn PDF document text
    • https://cdn.sqhk.co/mofisozulud/RtWgdjg/kikabeminasubima.pdfIn PDF document text
    • https://sojagifuwolu.weebly.com/uploads/1/3/4/6/134689160/6241327.pdfIn PDF document text
    • https://cdn.sqhk.co/fujigugi/hj5hgIr/sosapp_sos_emergency_app.pdfIn PDF document text
    • https://fukenotaza.weebly.com/uploads/1/3/2/7/132740373/24d51918b64c4.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/hdihhes/juxagig.pdfIn PDF document text
    • https://kofemadaki.weebly.com/uploads/1/3/4/6/134675418/a7c5aa.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/zazelujeju/rozajeliduxuvobizitu.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/nukoko.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/77452346374.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/hungry_caterpillar_cot_sheet_set.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_off0000b1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B1 5900 bytes
SHA-256: c7e76bb5a3dc4718f56375c88dfb7dfdb866399af57f3ee4f25b76484ae833db
font_01_sfnt_off0000c5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A9 10712 bytes
SHA-256: 1f37ddb24fb10d46a4039f4d54f54ba9bef430b49234dfe07f8dc4d6a75f34aa

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