Malicious PDF — malware analysis report

Static analysis result for SHA-256 d512763efad05e58…

MALICIOUS

PDF

77.0 KB Created: 2021-03-14 17:26:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8eabf2e4c806414923f783f093876759 SHA-1: 26f72ca1f471002ba69a97ec90bc91f90b02812a SHA-256: d512763efad05e588100bb826be357f004840b9e75098195c3abf6efa4717f81
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm. One prominent URL, 'https://midufefew.ru/wix?keyword=silent+ghost+apk+download+for+android', indicates a lure for downloading an Android application, likely a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and numerous URLs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/wix?keyword=silent+ghost+apk+download+for+android PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470540/normal_5fc5bc331fd19.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/iidhf9U/moto_x3m_2_kizi.pdfIn PDF document text
    • http://useraisins.pro/what_is_the_integration_of_cos_square_x_dx94qwe.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/wegijid.pdfIn PDF document text
    • http://tewatag.medianewsonline.com/aircraft_design_roskam.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/jejiijW/xukawuni.pdfIn PDF document text
    • https://kepelawurolunuz.weebly.com/uploads/1/3/4/0/134017158/547068.pdfIn PDF document text
    • https://cdn.sqhk.co/xotosobupis/UhC9geL/26628023776.pdfIn PDF document text
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/8591398.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376600/normal_6000f8ac950c8.pdfIn PDF document text
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/sixutewarugofolerup.pdfIn PDF document text
    • http://alphabitx.com/matudibowematodaxurewe594ck.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490367/normal_60017e4883d83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420240/normal_603327a284392.pdfIn PDF document text
    • http://copyrights-notices-helps.com/jagumotirubjrs4b.pdfIn PDF document text
    • http://effektzhizni.ru/629100436371g7s2.pdfIn PDF document text
    • https://zumuwezejulo.weebly.com/uploads/1/3/1/4/131455722/xogasidi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_2d0be1a67822422b818d6f30b2631bc7.pdf?index=trueIn PDF document text
    • https://de74b992-0de1-402f-a2cc-438209b178b2.filesusr.com/ugd/2693ef_8fdea14184c547aea347e257cc050d5d.pdf?index=trueIn PDF document text
    • http://fugufaza.myartsonline.com/28970369557.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_off0000ef2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2F 5560 bytes
SHA-256: d579148945b67a2997aa45fcc3537a56be78092ecdd8f27042dbfaa0f5e80406
font_01_sfnt_off0001022a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 10720 bytes
SHA-256: 79fc8b826a8c8003edd1677879dd135d883f76696e6a6a487e4694c6b62765bf

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