Malicious PDF — malware analysis report

Static analysis result for SHA-256 118fff1e62bbfcc3…

MALICIOUS

PDF

87.6 KB Created: 2021-03-15 04:04:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 86aa7f82882118097adb92622108f44e SHA-1: 032a2b8aaa51489ef5aea87ddd633efca1eaf97f SHA-256: 118fff1e62bbfcc321c45ae6fa8a1c59163323e003607d8746bd0a9e01e7f107
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm on disposable hosting, with numerous external URLs pointing to potentially malicious content. The embedded URLs and the nature of the heuristics strongly suggest this document is designed to redirect users to phishing sites or download further malware.

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 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://resalured.ru/123?utm_term=guideline+hiv+thai+2560 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495839/normal_60385d68c2b79.pdfIn PDF document text
    • https://kawolusasemosu.weebly.com/uploads/1/3/5/3/135397741/kupox.pdfIn PDF document text
    • https://puruvafapazono.weebly.com/uploads/1/3/0/8/130815059/daxog.pdfIn PDF document text
    • https://cdn.sqhk.co/livisade/Ukhjihb/79919342456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387806/normal_6031d29bce882.pdfIn PDF document text
    • http://ritegifufefut.scienceontheweb.net/how_to_tie_nylon_rope_knots.pdfIn PDF document text
    • http://pewujok.mypressonline.com/futefutizefavijupekujis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492546/normal_5fd65eb30f728.pdfIn PDF document text
    • https://rodedewosesuge.weebly.com/uploads/1/3/6/0/136010241/1121904.pdfIn PDF document text
    • https://lodarexuxune.weebly.com/uploads/1/3/4/3/134352809/sinom.pdfIn PDF document text
    • http://tapedazew.22web.org/tekorivazewixu.pdfIn PDF document text
    • https://cdn.sqhk.co/denepepunuja/hjNNhb8/78555080147.pdfIn PDF document text
    • https://fezewemekerod.weebly.com/uploads/1/3/6/0/136050953/41374.pdfIn PDF document text
    • http://mosuxuvemuzuwex.mywebcommunity.org/26826726120.pdfIn PDF document text
    • http://wegoluxetas.scienceontheweb.net/94843848670.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/19440246406.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/junarebivakoviwu.pdfIn PDF document text
    • http://kuxubakelixuzot.atwebpages.com/locomotive_air_brake_system.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/nebuwajolig.pdfIn PDF document text
    • http://jusexumiponif.rf.gd/how_to_sew_a_pleated_mask.pdfIn PDF document text
    • http://sizatopus.rf.gd/16_gauge_galvanized_sheet_metal_thickness.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000fff9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFFF9 14868 bytes
SHA-256: 9e65c73b15978860c885c02e12e8cccc10fc0c0bf9d592438af970660dab39f7
font_00_sfnt_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 5280 bytes
SHA-256: 6084902c038b1324120370d70f394274b9ca7f163848319990eacf0eae61a17b
font_02_sfnt_off00012939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12939 10740 bytes
SHA-256: b1d3463e9277451ec783a3ecbdc2b785f580aa9d7163acf2f705e5192d337b0d

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