Malicious PDF — malware analysis report

Static analysis result for SHA-256 15dcdeda66b9f816…

MALICIOUS

PDF

73.2 KB Created: 2021-02-15 02:52:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e75a5a226b8f529269f537817e79f286 SHA-1: 68ba413e921b752c5b2845a8761f2061a9ea0b4d SHA-256: 15dcdeda66b9f816e09d6148a3aea0b49adf62e09d020aaa2ca1bce42a82dc47
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 hosted on various platforms, indicative of a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content, potentially disguised as software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=descargar+my+old+boy+pro+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465274/normal_5fcf507a250da.pdfIn PDF document text
    • https://wexigovepabenu.weebly.com/uploads/1/3/0/7/130738565/buforo.pdfIn PDF document text
    • https://xamezorunag.weebly.com/uploads/1/3/1/6/131606231/vajenabikenibe_lavog.pdfIn PDF document text
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/dawakidubudo.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/8543837.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476569/normal_5fcbcefddad76.pdfIn PDF document text
    • https://dukalafaziwemum.weebly.com/uploads/1/3/4/7/134772398/zesenibebenaja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472213/normal_6029b6f895b9c.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/iejdtQ2/12777055438.pdfIn PDF document text
    • https://cdn.sqhk.co/golomamone/6iaUMgc/disney_plus_apple_tv_app_mac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450641/normal_5fc91de48daf7.pdfIn PDF document text
    • https://forupiwiwipugo.weebly.com/uploads/1/3/5/3/135349306/jibez.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/fobupojowojon/twitter_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/bergamota_doterra_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/gusokipanomigis.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/azonix_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/cbse_biology_notes_for_class_11.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/5961855380.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/android_bundle_fragment.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_off0000e057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE057 5700 bytes
SHA-256: c32f3834b7edfb5f5959466b28a6d43e04591b5f3fe40e0c579d612901e0b2f5
font_01_sfnt_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 10556 bytes
SHA-256: 4d6871dae043eb3b7e498875f453cb23a8c2c8f1885a4aebbd45bfc637fafa94

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