Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da6de17762adefa…

MALICIOUS

PDF

75.7 KB Created: 2021-03-11 02:12:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 31be48e2980dc5b3a00a62ba368a93db SHA-1: 6d6420da980ce4591780ce88339b32ad09821e40 SHA-256: 9da6de17762adefae7ff6e17a2c589765093ccbbba686d1a501fb2ee8ae2aa2a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting or unknown domains, indicating a link farm or phishing attempt. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0', and ML classification strongly flagged it as malicious. The embedded URLs suggest an attempt to direct users to malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • 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/wix?keyword=map+legends+worksheets PDF link annotation
    • http://moitender.org/hp_officejet_6700_premium_printhead_problemsj0mc.pdfIn PDF document text
    • http://osmosiotzs.fun/bapifokuway0gq8.pdfIn PDF document text
    • https://subarijarasojud.weebly.com/uploads/1/3/4/3/134332778/sajiduvanit.pdfIn PDF document text
    • https://vofitikasu.weebly.com/uploads/1/3/1/8/131871658/gebuv.pdfIn PDF document text
    • https://magapevalapa.weebly.com/uploads/1/3/0/8/130874167/451dd0811.pdfIn PDF document text
    • https://sanokigoj.weebly.com/uploads/1/3/4/8/134863934/351060.pdfIn PDF document text
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/2089707.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1509ac4-6971-4789-be52-372843191ac9/what_to_eat_to_get_in_shape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2d97a99-31d6-4ba8-bbcb-3fcbcc97c9f3/what_does_the_symbols_on_pokemon_cards_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bf87824-52d4-4011-b304-e741078c439b/astrology_books_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6989336-4484-4603-b00c-1488d7b44f7a/sound_blaster_z_se_review.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/curse_of_strahd_ireena_death.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dbc7569-f78c-4c7e-8dc3-dde749770612/71329606511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/457c80df-d994-4799-9dab-1cb93afadd7e/why_does_my_electric_heater_keep_turning_off.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2ca025e-3d8c-4979-bdf5-c49254b8e063/dapofogapuju.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/8917857066.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/html_link_stylesheet_media.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/55159905602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ab2834-3b26-481f-b68d-f732591e33f2/how_to_get_good_rap_voice.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/ishq_ki_baarish_song.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_off0000ecb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 5384 bytes
SHA-256: fd7474e33aed185232fb3b4f1145c4a2ff5d8ee2b6f122becc63c02ab3847408
font_01_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 10184 bytes
SHA-256: 21ac7f03c462324ca261e48f3447853e20e483bbbfba5bd05cdce85458369f4c