Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5174914369c881b…

MALICIOUS

PDF

79.8 KB Created: 2021-03-05 11:23:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2b0bb3b4d9146f1124b4b093bb67800b SHA-1: 9c29b4a3ddd01d475dd99a1168ed224f33a1b3b1 SHA-256: f5174914369c881b7337bc4e2d52a8dac4533081b0582c496cd54beb4e64e087
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

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://nipisod.ru/strik?utm_term=bosch+silence+plus+48+dba+how+to+start PDF link annotation
    • http://gilutij.iblogger.org/free_excel_spreadsheet_for_rental_property.pdfIn PDF document text
    • http://fivabigenarewo.22web.org/42639637627.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/dnd_5e_gunslinger_class.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_b17cc30d48fc410aac2614acec330775.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/bps_full_form_in_automobiles.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/77465213317.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/ultrasound_receive_beamforming.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/plan_y_programa_de_estudio_2011_segundo_grado_primaria.pdfIn PDF document text
    • http://regaguw.rf.gd/90748427168.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/luxizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a7b568-ab80-4b98-bd2a-a45636931bd7/33957190421.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/is_danby_a_good_brand.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/christian_video_messages.pdfIn PDF document text
    • http://zijomofi.epizy.com/78207312960.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/wijuvoxer.pdfIn PDF document text
    • http://jegafat.rf.gd/swiffer_wetjet_not_working_with_new_batteries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d23df71-9318-465e-b690-261ddaa23106/76241142652.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_b7800f4e37f24c17a215e3f3250ceb9f.pdf?index=trueIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_5ce1c52839534f8ab02c086b8c9fa386.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/gotupidijodirup.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/tibijejazemanegesobiror.pdfIn PDF document text
    • http://romofimor.onlinewebshop.net/how_to_reset_jabra_headset.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_off0000fb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 5724 bytes
SHA-256: b40e6cbf697106b8ab13b755816a74529cc169f6ef1f5c4c9a7e2cb3479cd573
font_01_sfnt_off00010ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA8 10212 bytes
SHA-256: d8f4575265d2674b18cfc258b8fc370bbe1fdd45aca721b570c253a66b384d94

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