Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0dc09e856881442…

MALICIOUS

PDF

134.4 KB Created: 2021-05-14 18:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2e84f286ad7adc31e99b5a35d504b1be SHA-1: 580e91f12e318f4304fe10f0eda02cc183fffa2a SHA-256: d0dc09e856881442598050b7da1d3780bbdfcdd3e2dd88d1b8f74d5ce2247080
186 Risk Score

Malware Insights

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

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 0.9989

Heuristics 6

  • 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.
  • 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://seumenha.ru/strik?utm_term=causal+inference+for+statistics+social+and+biomedical+sciences PDF link annotation
    • https://pewatusikowago.weebly.com/uploads/1/3/2/6/132683224/zimujed.pdfIn PDF document text
    • https://cdn.sqhk.co/loxexafetivu/8hdiahe/hello_bendy_machine_five_horror_night.pdfIn PDF document text
    • http://gixelube.iblogger.org/31004368746.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/Mhcgfge/zigenage.pdfIn PDF document text
    • http://simabozarulo.iblogger.org/28145175256.pdfIn PDF document text
    • https://kusipujetaz.weebly.com/uploads/1/3/4/4/134462876/ridopokudosab_donikiwaxufe.pdfIn PDF document text
    • http://zuvilivupeke.iblogger.org/bahubali_1_malayalam_songs_maango_me.pdfIn PDF document text
    • http://akvatehnika74.ru/56856455783clmmf.pdfIn PDF document text
    • https://fobewesepujub.weebly.com/uploads/1/3/2/3/132303403/kaxuzurav.pdfIn PDF document text
    • http://zeridizumof.iblogger.org/zanaxejesuteg.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzirixowev/ifhiKge/petazigakiri.pdfIn PDF document text
    • http://yognat.space/najonofogunejiruxerunixe8a7mx.pdfIn PDF document text
    • https://zabapekiji.weebly.com/uploads/1/3/4/4/134470890/9621739.pdfIn PDF document text
    • http://xojudesabesone.66ghz.com/zobedazotumosapupavumisuf.pdfIn PDF document text
    • https://govonomuvilikiw.weebly.com/uploads/1/3/4/6/134620083/6664061.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zubikexef.rf.gd/toastmasters_general_evaluator_report_form.pdfIn PDF document text
    • http://wediwejiju.rf.gd/dyson_dc25_animal_vacuum_cleaner.pdfIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_f0e2e3a83cb341a88d2cbe4290d02736.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_bed50cb2d9ec4bf2854e02f480b94e89.pdf?index=trueIn PDF document text
    • http://doxinaxa.epizy.com/rm-101_universal_remote_4_digit_codes.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001afc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFC8 5212 bytes
SHA-256: fb5750f617be74435aed14aad4cca56b2240e86cc20847b30293c6bd8c05268c
font_01_sfnt_off0001c169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C169 11732 bytes
SHA-256: 8c18989ef01fc45bc9a21f26091e1c038be3b666e90848c552a7df4405d1b34d
font_02_sfnt_off0001e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E812 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848
font_03_sfnt_off0001fcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCDA 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2