Malicious PDF — malware analysis report

Static analysis result for SHA-256 413cff499b865d6c…

MALICIOUS

PDF

70.5 KB Created: 2021-02-18 02:47:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c3803e9ef41091e2aa532873e9ea9829 SHA-1: e781e428c7ef77dc1cd362b7f6b37c7caf264f69 SHA-256: 413cff499b865d6cbb607103ae2456ffde6060873390d0304c9d7157210a57c4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, indicating a link farm or SEO manipulation tactic. The document body, though partially corrupted, includes a search query related to a common technical issue, likely intended to attract users searching for solutions. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via the numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://bologen.ru/strik?utm_term=why+does+my+angelcare+monitor+keep+losing+signal PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4530323/normal_5fc6c6bb769ff.pdfIn PDF document text
    • http://momentshop.website/jirukotumrdup.pdfIn PDF document text
    • http://gradstroy.su/kingdoms_of_amalur_alchemy_guideqkvbu.pdfIn PDF document text
    • https://nuzewotamomumaf.weebly.com/uploads/1/3/4/7/134701518/lazegupexafe.pdfIn PDF document text
    • https://sasikeruxet.weebly.com/uploads/1/3/4/8/134851076/906f8.pdfIn PDF document text
    • http://pomulagija.iblogger.org/30169730101.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402960/normal_5ff9f92cd23aa.pdfIn PDF document text
    • https://fegemuvu.weebly.com/uploads/1/3/2/6/132695633/220937.pdfIn PDF document text
    • https://zixavuxo.weebly.com/uploads/1/3/1/3/131398386/sawuzoxenamuwe.pdfIn PDF document text
    • http://dkmz1.club/57826375434bmq9e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tisudaxutuz.epizy.com/how_to_use_scanner_on_hp_officejet_4500_wireless.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/azure_backup_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/xerafazux.pdfIn PDF document text
    • http://xorabaza.rf.gd/nios_marksheet_image_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/dr_stone_episode_guide.pdfIn PDF document text
    • http://rifesos.epizy.com/candy_crush_soda_hack_apk_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/grade_2_math_elapsed_time_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/noginifuguvujer.pdfIn PDF document text
    • http://xakafof.rf.gd/remikexejefu.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/ribebuvogu.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB24 5668 bytes
SHA-256: f1ea311d32c249b68af4a69e613b6c6475b3a30110994481214c20930a78f9c5
font_01_sfnt_off0000de4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4C 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off0000e9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AE 9428 bytes
SHA-256: e7e3b79152630325cdfca8b0d6300f6f55c8b4effbfb7abc0ac57eed1419c616

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