Malicious PDF — malware analysis report

Static analysis result for SHA-256 2466307ad9108ebe…

MALICIOUS

PDF

84.0 KB Created: 2021-03-20 05:36:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81e7371fb3a59dda1635c8be810b305f SHA-1: b7cf690188e449a20c3c714b7032cca87ac77ed1 SHA-256: 2466307ad9108ebea5655ad3206c29a8660a10802e5d505ac38348f483338e5e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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 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://zajinet.ru/strik?utm_term=head+first+design+patterns+c%2523+github
    • http://depafelevan.22web.org/34668615869.pdf
    • http://dekagexagupeje.iblogger.org/us_foods_catalog_2019.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vubulebutaxa.epizy.com/seismic_monitoring_in_mines.pdf
    • https://s3.amazonaws.com/doxifuba/visivevuvadibulokuzir.pdf
    • https://s3.amazonaws.com/tojazudibumogab/ejercicios_trigonometria_secundaria.pdf
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_0329afa7373d4bc0907fc74a83f8cd52.pdf?index=true
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_fcd818fc730246dabb1db518c6e82164.pdf?index=true
    • http://wapupegalul.epizy.com/fortin_barometer.pdf
    • https://7722bba5-72ad-4d15-a72d-9ce9fbdcf1b5.filesusr.com/ugd/772ad5_810e3b99c821449393292023fabb3350.pdf?index=true
    • http://rinubef.epizy.com/87214756698.pdf
    • http://memonexato.epizy.com/axis_bank_rtgs_form_fillable.pdf
    • https://ff87c8b5-ca28-4ac0-94ba-218234037d87.filesusr.com/ugd/1d4e4f_e545c2eab4b24caea8650cc14b6c56df.pdf?index=true
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_b1d57785aaa24eb7a6fc8f0e7ef4b716.pdf?index=true
    • http://dewelimu.epizy.com/maplestory_v62_warrior_training_guide.pdf
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_4b55350861c148c08aa7cc8075bb9360.pdf?index=true
    • http://ruxofepugoloma.rf.gd/disease_surveillance_reporting_system.pdf
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_8b4af5b6064a4141b5f3c663837e7b82.pdf?index=true
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_5f01b77a9c9f4948b6bfa3a4f36aeb94.pdf?index=true
    • https://s3.amazonaws.com/sajatesawodiji/37378866585.pdf
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_948c59758bc84fc1827587f2048dc777.pdf?index=true
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_6933021b59fa42e5a22f5a473b656b7d.pdf?index=true
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_152d871ad2fe4d03ab0ef1dffa5663c7.pdf?index=true
    • http://tutalogivenerok.epizy.com/20634956575.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fee5.bin
ccd2643bec37937776e397813ba57cc02699ecc8d5757b9d655ec261715f876e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 5252 bytes
font_01_sfnt_off000110d7.bin
baf12c853dde8e4916afb3c20e3138395abb5f8ffd051427331eba1268d6c7f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110D7 15892 bytes

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