Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71fd6a05d18c195…

MALICIOUS

PDF

76.3 KB Created: 2021-02-23 11:26:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a452c41bf66928d086b63b44a98531b5 SHA-1: 66445e75cee51ca198fb6379fa5665ca39f2a8e9 SHA-256: f71fd6a05d18c1951726a768bab5a2d37cd0e0b087d76adf0ba41ea3d135ba72
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a link farm detection and a critical ClamAV signature. The document contains numerous external links, with one prominent URL pointing to 'druttle.ru', suggesting a phishing or malware distribution attempt. The presence of a link farm indicates an attempt to manipulate search engine results or distribute content across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=medialink+ac1200+setup PDF link annotation
    • https://wafumaxa.weebly.com/uploads/1/3/5/4/135400811/c0e24a0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459166/normal_5ff7939ac48bf.pdfIn PDF document text
    • https://watoniworawi.weebly.com/uploads/1/3/4/8/134871767/jikadabinabi-jatozabufamano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384144/normal_5ff75f6a489de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427526/normal_5fe698bd99cd1.pdfIn PDF document text
    • http://baltika-trans.ru/56797053326dsev7.pdfIn PDF document text
    • https://dakikizubebara.weebly.com/uploads/1/3/4/8/134889455/nimesikeguwiniz-xowodimivawaxi-lowizezev-xevutidujuzir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495838/normal_5fe9dc38c8e0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478383/normal_5fdeeba4138ec.pdfIn PDF document text
    • http://itgermany.net/how_big_is_the_quran_compared_to_the_bibleoe2x8.pdfIn PDF document text
    • https://poperetaro.weebly.com/uploads/1/3/4/8/134893078/4063c.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/zerepuzuze/64916707225.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/video_er_for_instagram_apk_inshot_inc.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/android_10_nokia_2._2.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/boled.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/35289756927.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/povinagizito.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/police_report_online_san_diego.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/muxugison.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/elder_scrolls_4_oblivion_lockpicking_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/fozagakimaxi.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_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 5368 bytes
SHA-256: a1cae65c9bd75575603bbe2b6a19d82d56a771a420edb895bdcd281869dcb8b5
font_01_sfnt_off0000ff7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7E 10648 bytes
SHA-256: 8d9f325dcdaaf5cdde79d5257f27614eed82e75be2aabb3c3ccc36f83c3bcbe5

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