Malicious PDF — malware analysis report

Static analysis result for SHA-256 138d1fb4931c1d88…

MALICIOUS

PDF

77.3 KB Created: 2021-04-09 08:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1a11e48db59fe7ba74387df4cf222e31 SHA-1: 74a255499946e15ba3e7302c3420907aa213f2de SHA-256: 138d1fb4931c1d889e24b005c74124c3fa08d99c620bb9c1fefe5cb58e2a34a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=are+infrared+heaters+better PDF link annotation
    • http://riragukigud.scienceontheweb.net/astm_a240_15.pdfIn PDF document text
    • https://cdn.sqhk.co/dorumexogik/icGEAia/35928219646.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/ggfigig/pexedevu.pdfIn PDF document text
    • http://pofefazuvalime.iblogger.org/96191909782.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/ejigjsl/pitonenap.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/add_2nd_edition_dungeon_masters_guide_download.pdfIn PDF document text
    • https://labifunuvi.weebly.com/uploads/1/3/4/8/134847398/pebasugujatude_tisapimof.pdfIn PDF document text
    • http://kaxazul.iblogger.org/71241610230.pdfIn PDF document text
    • https://cdn.sqhk.co/lufelumad/7iecugc/javuwojep.pdfIn PDF document text
    • http://vuvodagedene.scienceontheweb.net/frontline_magazine_june_2020.pdfIn PDF document text
    • https://lotunesu.weebly.com/uploads/1/3/0/9/130969364/e6ccc05cddec.pdfIn PDF document text
    • https://riwozetamozu.weebly.com/uploads/1/3/4/3/134331456/91422e0b256.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zusozeduraxo.epizy.com/modapa.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/diragujatesilonajad.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/growatt_inverter_5kw_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/wemoleresuta.pdfIn PDF document text
    • http://sojufuka.atwebpages.com/monusuwura.pdfIn PDF document text
    • http://tipipigi.atwebpages.com/how_to_put_ground_coffee_in_keurig_2.0.pdfIn PDF document text
    • http://tarepos.onlinewebshop.net/ielts_reading_academic_band_9.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_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 5092 bytes
SHA-256: 7d83ef2e4271bcb7c677ee1221952c58c89099009ec2bddf4ae147856b8b436a
font_01_sfnt_off00010359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 10872 bytes
SHA-256: 44072f9b90be43f85e4c44786421a075923bc509ef5dbd38bf716c28b6e24cac

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