Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c070dc5d37c7be…

MALICIOUS

PDF

88.8 KB Created: 2021-05-19 20:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 58c294188752300beb3715cff798d64f SHA-1: e8664af6ca5e24ec8531800745ed64336cf444d3 SHA-256: 27c070dc5d37c7beff6177594c4887a6e296fb95d0164b8b5e1db0531f281656
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or malware distribution, and was flagged by ClamAV as a phishing trojan. The document body, though corrupted, suggests a lure related to 'Acids bases and solutions chapter test answer key'. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a strong intent to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/strik?utm_term=acids+bases+and+solutions+chapter+test+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4427544/normal_5fdf1586d3232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468530/normal_5fe7364ad9f97.pdfIn PDF document text
    • https://tizupokewa.weebly.com/uploads/1/3/4/0/134013062/fd1455d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493610/normal_6065d0fca019a.pdfIn PDF document text
    • https://jugoneworo.weebly.com/uploads/1/3/4/3/134307205/2952772.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380674/normal_5fcf6d9cb1095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407562/normal_6018760f1cd23.pdfIn PDF document text
    • https://fetepidema.weebly.com/uploads/1/3/4/6/134684810/digutaxirubip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454809/normal_5fe7adb57ac32.pdfIn PDF document text
    • https://fafenerukore.weebly.com/uploads/1/3/1/3/131398145/8358462.pdfIn PDF document text
    • https://dizegeduwawab.weebly.com/uploads/1/3/4/3/134374994/zekeduwavewopopiloza.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/wesezuzuvalirik/icc_guide_to_incoterms_2000.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/remewalimerez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1359eb31-5b85-4a29-bc5d-b1e5b0ca2555/how_to_print_a_free_birthday_card.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/38669290001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/075460ef-0b2a-4528-85bd-c5c845f53530/71061799632.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/autodesk_revit_lt_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/16866220859.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/bugabitixokodidoramojiki.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/78464755305.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/jawunosixodijaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b26a031-50c4-470d-a9ee-25b1baa66a0c/gogajugemi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10349 5548 bytes
SHA-256: d760409b580d74c975b2a9441ce7ab2a19118cb173d968ba7e2534505fd8f2b7
font_01_sfnt_off00011630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11630 11480 bytes
SHA-256: 0324c5c006b6d8955449e928f2e818b42378bdb777a72f05c93223b7fb6c5a33
font_02_sfnt_off00013db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB8 16200 bytes
SHA-256: 2f2ca06db9597521335da61e9fb78f5cc319a63d208c567899a9c79a6f7c8608

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