Malicious PDF — malware analysis report

Static analysis result for SHA-256 c190b22638a031ae…

MALICIOUS

PDF

84.7 KB Created: 2021-04-15 02:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a6727c296f03f555f0785ca34140c185 SHA-1: f2494441d3fbd373a7877aa6cbdafcddef96a5d2 SHA-256: c190b22638a031ae1703d9799bd69906f854a82fb40cf42d34581f3e7d3a4541
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated, but the presence of links and the heuristic firings suggest an attempt to redirect the user to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=razor+e300s+seated+electric+scooter+weight+limit In PDF document text
    • http://xafomona.mypressonline.com/valutaforuk.pdfIn PDF document text
    • https://wuxijize.weebly.com/uploads/1/3/4/6/134685372/xuvebebu-xawipufa-jetezutu-jelagobajok.pdfIn PDF document text
    • http://vomidujoma.scienceontheweb.net/principles_of_aseptic_processing_and_packaging.pdfIn PDF document text
    • http://nerazegizetikam.getenjoyment.net/37952455778.pdfIn PDF document text
    • http://merulabodonulu.iblogger.org/14651101670.pdfIn PDF document text
    • http://lotsmen.com/subisojaximibifidesaxmcyti.pdfIn PDF document text
    • https://gurelupukuji.weebly.com/uploads/1/3/0/7/130775622/939898.pdfIn PDF document text
    • http://bufo.online/dizupagavuwulukebudigt1u.pdfIn PDF document text
    • http://navawawav.22web.org/kexafoninosomifive.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://punotonaduwize.atwebpages.com/the_largesse_of_the_sea_maiden.pdfIn PDF document text
    • http://telenusu.epizy.com/linear_motion_word_problems_with_answers.pdfIn PDF document text
    • http://nasezerusutupe.rf.gd/norton_antivirus_android.pdfIn PDF document text
    • http://jofarasaxorepow.rf.gd/nojojo.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/pofakuru.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/5442647339.pdfIn PDF document text
    • http://sagalesokalu.epizy.com/97683407081.pdfIn PDF document text
    • http://taxifegizuni.epizy.com/how_to_identify_peoples_personality.pdfIn PDF document text
    • http://maguvunu.epizy.com/darejipisomilutizogif.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001002d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 5492 bytes
SHA-256: c6a02e42533c4ac614ca21bceaa05b84acad5b37ad90762c5d15ca6a60be148f
font_01_sfnt_off000112f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F6 10600 bytes
SHA-256: 9174965a73e19954053170debbe36a4dd76569e5c9de12b6d6329744e8929258
font_02_sfnt_off0001371b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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