Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c4be3e1658fb04…

MALICIOUS

PDF

73.6 KB Created: 2021-02-12 12:41:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a808ca3d31ad609f253c95988aec2517 SHA-1: 0652afcc6e12debb3d4f297f4ea2529342fa67a4 SHA-256: 37c4be3e1658fb04671d01e17b6c1ed5bbbc5ce09d000be7e4ee72b625bffb83
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to downloading a file, and a heuristic indicates the presence of a download button lure. The ML classifier also strongly flagged this PDF as malicious, suggesting it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/wix?keyword=download+ustv+pro+apk+file In PDF document text
    • https://static.s123-cdn-static.com/uploads/4405179/normal_5ff87f05511f1.pdfIn PDF document text
    • http://ita-bio.fun/conundrum_book_anuj_dhar_freepwiv9.pdfIn PDF document text
    • https://rilavowa.weebly.com/uploads/1/3/2/7/132740415/xoxekelagilamolop.pdfIn PDF document text
    • http://avto-trokot.xyz/amalina_malaysia_songonykv.pdfIn PDF document text
    • https://ropugobefele.weebly.com/uploads/1/3/4/4/134445072/rusimubipulu.pdfIn PDF document text
    • http://idealica-uficiale.website/13399864823t7kfu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390366/normal_601e43301148d.pdfIn PDF document text
    • http://4gusevshop.website/91801031853nmj0v.pdfIn PDF document text
    • http://iminn.ru/57076122487ukf24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466680/normal_6019822469db3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452595/normal_5ff0a551556f0.pdfIn PDF document text
    • http://gufutaca3.xyz/arduino_1._6._54zab1.pdfIn PDF document text
    • http://rastet-malysh.ru/balance_druid_raid_guide_bfae4qy3.pdfIn PDF document text
    • https://lemusudavigi.weebly.com/uploads/1/3/5/3/135395292/4071952.pdfIn PDF document text
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/bbe4dda6923fad1.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/xuzakob/complicated_avril_lavigne_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/8541819513.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/cfa_level_1_mock_exam_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/chicago_fire_season_1_episode_9.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_off0000dadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 5252 bytes
SHA-256: 2af183b5fa9c1aca79f5724f3762793d24401204bf334f7357d477362930e07f
font_01_sfnt_off0000ece6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE6 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000f573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 10556 bytes
SHA-256: 699df119be61ef95996800d01f92f480a4d1a468ee82dde1e9e0e776c83a4445

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