Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4df0fa30d8efdd9…

MALICIOUS

PDF

83.7 KB Created: 2021-05-05 15:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4d998b063f9071ae92be8da175fc304d SHA-1: 95a9551674c6243b4a1af7f176d20799c60ef558 SHA-256: a4df0fa30d8efdd9b273939aabba803a8e14092e341050975c51ea86406c56e9
86 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, embedding a large number of URLs designed to direct users to external websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting and redirector parameters like 'utm_term', suggesting an attempt to manipulate search results or distribute malicious links. The ML classifier strongly flags this PDF as malicious, supporting the conclusion that it is part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://leonvi.ru/strik?utm_term=the+cup+of+god%2527s+wrath+bible+verse PDF link annotation
    • http://italysummer.fun/report_false_advertising_australiaqvlzp.pdfIn PDF document text
    • http://wegansit.space/nefiradaso03dv8.pdfIn PDF document text
    • http://twoup-viktoria.online/where_can_i_donate_baby_gearxbkna.pdfIn PDF document text
    • http://itagreen.fun/love_wadan_sinhalae83zt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383692/normal_6041e1bdf3898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481665/normal_604b92914b0fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476150/normal_603e4b9bd222a.pdfIn PDF document text
    • http://euromarket.pro/vevufobiwugomebazf1l3.pdfIn PDF document text
    • http://goproits.com/atomic_absorption_spectroscopy_lab_reporteqa6e.pdfIn PDF document text
    • http://vizionsmc.net/can_soccer_betting_be_profitable5ahtz.pdfIn PDF document text
    • http://keepxufi.space/posumeduxowozivobotiseney2w5q.pdfIn PDF document text
    • http://english-10.site/96936480128z62gq.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/jujadodedaruxix/ahri_guideline_k.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c817f2f-33cf-460c-8bdf-8a02cd51703c/how_to_write_a_movie_pitch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9fa1beb-b081-4ff6-a1f5-96837101a4bf/jademolobepajido.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/xixemixijineweniwalotikej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642db173-a55b-4692-aa1e-f3744bbfa6df/pixilid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b21ab2c-d18c-4565-86f9-dfeaffd6bc1d/what_you_need_to_know_when_buying_an_existing_business.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/free_online_tarot_reading_yes_no_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/92729180628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c260f143-faaa-4ba7-8b39-08bd32504a81/dekarusigujosixedejip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6607b0aa-b672-4803-9bce-61b797e6ddb4/wikon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e261d6e5-0546-47db-b40f-2cd22bfd548c/80735327891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0f3e18c-0396-45af-8a73-304829f7e6dc/47786523639.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/wills_eye_locations_in_nj.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_off000108a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A3 5692 bytes
SHA-256: 9814bea91b458791c4d2938221289d0a0bbd0e6e7e22c455607aa14ddeed309e
font_01_sfnt_off00011c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C14 10924 bytes
SHA-256: 2e5e21f12fcb1aa0fdd274abeb187d7929839f627e881372335637b8f44c96e2