Malicious PDF — malware analysis report

Static analysis result for SHA-256 b850868778400d04…

MALICIOUS

PDF

80.9 KB Created: 2021-02-23 18:03:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8c366bbadad1ea33e03afeb8cc4f2c70 SHA-1: 76432bed00071a2212cda2cc695564461238d5d2 SHA-256: b850868778400d044e43b0bad31346e24922803743cfa003190063e659d6e372
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=final+fantasy+tactics+a2+guide+pdf PDF link annotation
    • https://jaxenexeleti.weebly.com/uploads/1/3/5/3/135320290/vozedenox_lozumik_tupozimel_wimamokojepe.pdfIn PDF document text
    • https://xaxuxogupovugid.weebly.com/uploads/1/3/0/8/130874119/tonavip-viwodapogeguwiz-kapewukezojoza-faxitoro.pdfIn PDF document text
    • https://jajibesuwazigix.weebly.com/uploads/1/3/1/3/131383486/liwaxa.pdfIn PDF document text
    • https://rigupanikoma.weebly.com/uploads/1/3/5/2/135297472/xifebuxu.pdfIn PDF document text
    • https://befomunuduti.weebly.com/uploads/1/3/1/1/131164266/kolejenalefe.pdfIn PDF document text
    • https://kasapumaf.weebly.com/uploads/1/3/1/3/131397987/raputupulabinezomet.pdfIn PDF document text
    • https://meligobuv.weebly.com/uploads/1/3/1/0/131070858/gujaxiroranurum_pajubiloke_gabufe.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/mutirexa/14190223433.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/calibre_software_for_kindle.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/6764368110.pdfIn PDF document text
    • http://fumejiwa.epizy.com/buy_windows_server_2012_r2_standard_key.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/percy_jackson_and_the_lightning_thief_novel_download.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/50617271647.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/qld_tv_guide_mackay.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_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 5416 bytes
SHA-256: 426951a821a33859a4151f4b2b5410138902b0fe012b95755744339097625a8a
font_01_sfnt_off00011376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 10212 bytes
SHA-256: d8ea869485fec12c310315564079c64c026d0d4895d53ca57bc701aa401d5396

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