Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff88866fe8895ba…

MALICIOUS

PDF

75.6 KB Created: 2021-02-25 03:50:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6a9ec7694f6f836c34133668db3d6edb SHA-1: 9e8cde8fba6b492f0d89678d26c29d1d159d3455 SHA-256: 2ff88866fe8895ba178d93db626a269b1d4a69bb82ebcf476cd09e90c40cb7e9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to Weebly-hosted PDF files, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the ClamAV detection strongly indicate a malicious intent, likely to direct users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=msi+h81m-p33+bios+chip PDF link annotation
    • https://jedijevabepepox.weebly.com/uploads/1/3/0/7/130739982/7798444.pdfIn PDF document text
    • https://valodoxajub.weebly.com/uploads/1/3/4/4/134435871/8e3b668cc83d.pdfIn PDF document text
    • https://xoresobo.weebly.com/uploads/1/3/1/4/131407398/3eeafecbd.pdfIn PDF document text
    • https://mipurokuniveg.weebly.com/uploads/1/3/4/5/134508865/zaseso.pdfIn PDF document text
    • https://kopezufotixese.weebly.com/uploads/1/3/1/1/131164020/zuxorapajexib_lopesanir_sejegeriferag_fogofuxugaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484636/normal_6014e8159aecf.pdfIn PDF document text
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/fifagevelumu_zitafojobotesot_luwufeweroga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377371/normal_60072c33795a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pulupalu.epizy.com/31770557940.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/votega.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/huawei_p20_lite_android_9_update_date.pdfIn PDF document text
    • http://topemuzopapegu.epizy.com/wowhead_artifact_appearance_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/68585906578.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/how_to_write_report_in_english_format.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 4904 bytes
SHA-256: b0a682754e3858a811a8a86456c976a1b5e4723081d1e707014f988da8128377
font_01_sfnt_off0000ed6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 11592 bytes
SHA-256: 6b84090534715bdd4df57ce8c9e1b86a93b6ec2b9d7cf5a3b31b6e06f6600580
font_02_sfnt_off00011331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11331 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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