Malicious PDF — malware analysis report

Static analysis result for SHA-256 541adb9070591dee…

MALICIOUS

PDF

77.2 KB Created: 2021-04-24 17:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: da0a6e25a44dfe8ee61d0904ba32876d SHA-1: 7c78972579c1a5945bc4b5dc394cc9e2112d7fba SHA-256: 541adb9070591dee43bf444db425df07e8a46e979b663f2cc8ea61b831ac4287
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO spam. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=how+do+i+know+if+my+drill+battery+or+charger+is+bad PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489415/normal_6062bf1aa9339.pdfIn PDF document text
    • http://women-ita.space/after_book_series_in_order_anna_toddilxdz.pdfIn PDF document text
    • http://gazajujana.mygamesonline.org/british_gas_bill_example.pdfIn PDF document text
    • http://veronaital.space/1550560881n8qto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393489/normal_606e9a8bee59d.pdfIn PDF document text
    • https://sosakenokez.weebly.com/uploads/1/3/4/4/134445245/50047.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_5fe75dcacbdce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449424/normal_6013263eacdfd.pdfIn PDF document text
    • https://bomusega.weebly.com/uploads/1/3/4/6/134656079/zanor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370055/normal_6006a958eb686.pdfIn PDF document text
    • http://cancandance.org/trombosis_venosa_profunda_tratamiento_anticoagulante1v8jb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_606e0476c12d8.pdfIn PDF document text
    • https://ponirusorigimo.weebly.com/uploads/1/3/0/7/130738629/5093702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483075/normal_5fd10449bc799.pdfIn PDF document text
    • https://xexiroxenokela.weebly.com/uploads/1/3/4/6/134613030/5cad6e9b39e1e3.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
    • https://s3.amazonaws.com/gonima/budazikakivexid.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/credit_note_and_debit_note_format.pdfIn PDF document text
    • http://jagomizaf.atwebpages.com/april_2020_current_affairs_in_gujarati.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_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 5584 bytes
SHA-256: 133b8a29522b6f18af330f5852783b12aade7fbc4efb5bfb26add7063cd96abe
font_01_sfnt_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 10716 bytes
SHA-256: b7314031a9ede8e154fc51e47aeae6a4651f276478c1d2aa37fd476472e327ef
font_02_sfnt_off0001194c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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