Malicious PDF — malware analysis report

Static analysis result for SHA-256 305ca8142eecaf37…

MALICIOUS

PDF

80.8 KB Created: 2021-02-25 19:58:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ad9f9fc5526feef309ef003f6f325a78 SHA-1: bb2a90386bb69da4ed52e033dab339e9e2a5f3f2 SHA-256: 305ca8142eecaf37bd1e9b0f01e29fbab3371e2b6140ac44343aabf5abb548c1
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirectors or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were extracted, the heuristic firings and URL analysis are sufficient to infer a malicious intent to redirect users to harmful sites.

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
  • 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.
  • 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://crophysi.ru/wix?keyword=zoll+m+series+cct+manual In PDF document text
    • http://kunujunekedi.mygamesonline.org/the_other_side_of_midnight_book_quotes.pdfIn PDF document text
    • http://springtea.space/ancient_ointment_4_lettersht9zs.pdfIn PDF document text
    • http://fordist.ru/1021107552185d3l.pdfIn PDF document text
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/pesal.pdfIn PDF document text
    • http://qqkaxes.xyz/75044903652f0lo9.pdfIn PDF document text
    • http://dibiwunineso.iblogger.org/72369448563.pdfIn PDF document text
    • https://belanuxaru.weebly.com/uploads/1/3/4/6/134670531/2377575f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486984/normal_6006d4e4b3d1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388280/normal_6005752abf4c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375518/normal_60372b84632a5.pdfIn PDF document text
    • http://deteluwo.iblogger.org/appvn_apk_7._0a.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/59144375101.pdfIn PDF document text
    • https://tenipimip.weebly.com/uploads/1/3/4/0/134042327/dujalamobotilope.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
    • http://botibaxar.rf.gd/letter_from_santa_free_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/57602076884.pdfIn PDF document text
    • http://tinuguv.epizy.com/wapajuvex.pdfIn PDF document text
    • http://takamuwemevofe.epizy.com/workbook_question_answers_of_television.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/chelsea_fc_images_free.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/88426923636.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_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 4784 bytes
SHA-256: 99a275b4252bbaaf8db8d869cfd8b0de1e7ecbfe4b6c8355fbb902a4ae9a71ba
font_01_sfnt_off0001035a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035A 10760 bytes
SHA-256: 428417d590a7d2f29f038702cd067ecd50cbdcdc0785a5f3a4254a975a8dc21a
font_02_sfnt_off00012827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12827 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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