Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec934f6a262f733f…

MALICIOUS

PDF

79.0 KB Created: 2021-05-20 23:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 49b0d30819585e94a124d3c3fb237c5d SHA-1: 03db68a5d70292a3ac0a2db93f4c369380308033 SHA-256: ec934f6a262f733f90450592956c0f5f4608ab53f54977443c376236a2a83d5e
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gimoguvi.ru/strik?utm_term=stick+war+legacy+apk+day%25C4%25B1+para+hilesi+indir PDF link annotation
    • https://serirufudo.weebly.com/uploads/1/3/4/7/134712976/df3ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_600b131556396.pdfIn PDF document text
    • https://rewajugelawuz.weebly.com/uploads/1/3/0/7/130738764/8370515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371806/normal_601db735c43e4.pdfIn PDF document text
    • https://nokidekuget.weebly.com/uploads/1/3/4/6/134669445/liwarosibinazabikan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379726/normal_6023fea0ed021.pdfIn PDF document text
    • https://koponabunabo.weebly.com/uploads/1/3/4/5/134520941/jegazemom-zoladerunibin-bomijiridep.pdfIn PDF document text
    • https://wapaberupuz.weebly.com/uploads/1/3/5/3/135397773/28caeb57b97f10.pdfIn PDF document text
    • https://xefakiradu.weebly.com/uploads/1/3/1/8/131856624/debelan-sitofunamomomaz-joxupika-zubovuxizumatur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384310/normal_6046658a8680e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487905/normal_5fe475bd9ecdc.pdfIn PDF document text
    • https://tewafegode.weebly.com/uploads/1/3/5/3/135350941/kenajaxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385422/normal_6051dd681eec1.pdfIn PDF document text
    • https://pefasuvut.weebly.com/uploads/1/3/4/7/134716349/tiweforadupusovow.pdfIn PDF document text
    • https://vavaxurose.weebly.com/uploads/1/3/0/7/130775274/95321170a6c554.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/lixuzo/principles_of_marketing_midterm_exam_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/romixevivunugaraxum.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/pdp_xbox_one_controller_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/26905916686.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/verarenaretavenavonot.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/wamusiwujudefu.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/what_type_of_energy_does_a_windmill_use_to_do_work.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC28 5728 bytes
SHA-256: e5c3504827566e51136cfcefefb41eab1899a5db5d07aec67e80210eae83caeb
font_01_sfnt_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 11944 bytes
SHA-256: 118dfb2c11beefe531d228e4962336aa80021ab59279b1782038bd9ef94c28cb
font_02_sfnt_off0001152a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152A 16592 bytes
SHA-256: d01da227763dd1268137ae4b995fb9af6bf7f8ffb759543b54d8d019ecb2a799