Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5f64a3228a2230…

MALICIOUS

PDF

74.9 KB Created: 2021-02-26 05:37:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3ac6db4babf3ad2eb42e4a0a5ef0fd98 SHA-1: 23ee01bd492ee0b4bb6eb273059a89540e0aceb7 SHA-256: 4e5f64a3228a22300bad707e8946adca75fce2f22710a143471841463f4228c0
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with a heuristic identifying it as a link farm. The document body, though partially corrupted, suggests a lure related to 'tax return calculator 2020 ato'. The presence of multiple suspicious URLs, combined with ClamAV and ML detections, strongly indicates a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

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://jacksth.ru/wix?keyword=tax+return+calculator+2020+ato PDF link annotation
    • https://zosagobe.weebly.com/uploads/1/3/1/3/131380163/tejogigaparor-jejamuxin-dusifakisurod-pozemeligijibov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_601586bc97af0.pdfIn PDF document text
    • http://mamajan.space/how_to_put_sim_card_in_samsung_a10_phonedbhyc.pdfIn PDF document text
    • https://xifugewelude.weebly.com/uploads/1/3/4/3/134353264/libuxizotaj-zazowitetokixa.pdfIn PDF document text
    • http://remastacer.com/28349118345zxcof.pdfIn PDF document text
    • http://hocostyle.ru/crusader_kings_2_3.2.1_patch_downloadjg4yt.pdfIn PDF document text
    • http://com-connexion.xyz/fe3_fe2_et_mno4-_mn22jo3m.pdfIn PDF document text
    • http://idealsit.space/hookes_law_lab_answersssyxq.pdfIn PDF document text
    • https://bopunesarikimar.weebly.com/uploads/1/3/1/4/131453984/13bf41e3cb.pdfIn PDF document text
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/savedutejalawivawuge.pdfIn PDF document text
    • https://wipemaxo.weebly.com/uploads/1/3/5/3/135345075/kofegevadeboviz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407996/normal_5ff50a4281cde.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/wutogugej/rotunewevukezikuluram.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/ielts_exam_samples.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/57986717412.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/12220093361.pdfIn PDF document text
    • http://pepebejawu.epizy.com/90405401112.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/elric_of_melnibone_comic_download.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_off0000e8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A1 4904 bytes
SHA-256: 17874279a4843058afbc743e30593b70bc446f5937c1d54bbe8f8eda5ca9be89
font_01_sfnt_off0000f95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95F 10768 bytes
SHA-256: 6a5733e23b610a7ce83902a9f58667e1619903ac54138d1cbafaaca9e96d0381

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