Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebea5b53c1a16124…

MALICIOUS

PDF

71.9 KB Created: 2021-02-21 17:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 3e0ac2f30ee4c35fa674f7e3f801db3c SHA-1: 618e0b25177103717fc86bb5892cb54900526cbd SHA-256: ebea5b53c1a16124a600e6ed4fb1cecd304fc31434b48ce128cdc497261aad87
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The document body, though partially corrupted, contains a search query related to audio equipment, likely a lure to direct users to malicious sites. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ML and ClamAV detections, strongly indicates malicious intent. No scripts were extracted, but the overall structure points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://bologen.ru/strik?utm_term=how+to+connect+bose+acoustimass+to+receiver PDF link annotation
    • http://dovoxijego.iblogger.org/57277849027.pdfIn PDF document text
    • https://xidoxuzi.weebly.com/uploads/1/3/4/7/134707988/penaji.pdfIn PDF document text
    • https://tejukazirinari.weebly.com/uploads/1/3/1/3/131398521/befelan-butesanebamuki-misizeposoj.pdfIn PDF document text
    • https://jikolugoxolij.weebly.com/uploads/1/3/1/3/131379047/f8e82a.pdfIn PDF document text
    • https://kinoxumore.weebly.com/uploads/1/3/4/4/134463035/1675882fc4.pdfIn PDF document text
    • https://rapelolizoxofi.weebly.com/uploads/1/3/1/3/131381924/b537f14.pdfIn PDF document text
    • http://pakimudemezir.iblogger.org/desogis.pdfIn PDF document text
    • https://pituxujufu.weebly.com/uploads/1/3/1/8/131856071/jibarosivok_pivafuzab.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/jf5Hjb9/39318548633.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/iaytnig/ice_cream_cone_cake_holder.pdfIn PDF document text
    • https://juwexulomo.weebly.com/uploads/1/3/4/3/134385858/9823938.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/eidrgeA/nubowizofasetegoluz.pdfIn PDF document text
    • https://disipewadapa.weebly.com/uploads/1/3/4/8/134870645/7738380.pdfIn PDF document text
    • https://cdn.sqhk.co/dijowasedop/oij4Uhf/7699276630.pdfIn PDF document text
    • https://zovarufegurer.weebly.com/uploads/1/3/4/6/134625168/a9df3388.pdfIn PDF document text
    • https://cdn.sqhk.co/vozevadijut/DickgiX/46694407873.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/jugobimuraje/audioquest_dragonfly_red_with_android_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/apna_time_aayega_mp4.pdfIn PDF document text
    • http://kozusabupo.epizy.com/pafosujerawisoxesarozusek.pdfIn PDF document text
    • http://tuwafuvokix.rf.gd/meditation_guidee_cedric_michel_lacher_prise.pdfIn PDF document text
    • http://xajizufobuvofo.epizy.com/xenuto.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/understanding_business_11th_edition_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/archero_hile_apk_1._2._2.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_off0000db8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 5168 bytes
SHA-256: 0609505097c5c85ff54d0c1891e6087cbfef74b303d95d0369119884b2129b19
font_01_sfnt_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 10632 bytes
SHA-256: 40f678d4697038bbf737f2a7b2dacf92bff9b0f6485fcf26ded114651ec3ee06