Malicious PDF — malware analysis report

Static analysis result for SHA-256 a828cc691cf64342…

MALICIOUS

PDF

82.0 KB Created: 2021-04-09 17:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ab2481871ae98976ec315f7e67901ee0 SHA-1: 2021b5f1d2bfdf97364b3380307b1d224b78d582 SHA-256: a828cc691cf6434266f66e742349f55296a3bf931c98b3512eb69b9468dfdd79
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to disguise malicious links within a large number of seemingly legitimate ones. The primary malicious URL identified is https://resalured.ru/strik?utm_term=human+computer+interaction+masters+canada, which is likely used to host phishing content or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://resalured.ru/strik?utm_term=human+computer+interaction+masters+canada PDF link annotation
    • https://robivobaxo.weebly.com/uploads/1/3/0/8/130873737/nususirabuzis.pdfIn PDF document text
    • http://kidiwutimako.mygamesonline.org/36470623879.pdfIn PDF document text
    • http://cloudplay.xyz/686349901933fyd5.pdfIn PDF document text
    • https://kewakovek.weebly.com/uploads/1/3/4/4/134467638/nigupidagunediver.pdfIn PDF document text
    • http://govnosiakxws.online/lanelezebilo6kqkd.pdfIn PDF document text
    • https://faloxumotib.weebly.com/uploads/1/3/4/6/134646793/ebe9d.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/jifumakotatiter_tuvonefezizav_kutiguwegasetal.pdfIn PDF document text
    • http://jarobadut.22web.org/bullet_bandi_song_dj.pdfIn PDF document text
    • http://daniele.store/kronos_4500_time_clock_user_manualalo62.pdfIn PDF document text
    • http://armlur.space/77307942588erc0s.pdfIn PDF document text
    • https://penomagara.weebly.com/uploads/1/3/2/6/132695387/dfcc7a52d6.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/al_quran_file_free_download.pdfIn PDF document text
    • http://static-start.top/jawijo54jpn.pdfIn PDF document text
    • http://kokofiru.22web.org/jamadar_answer_key.pdfIn PDF document text
    • http://daddytestit.xyz/bemubejogo5vqzq.pdfIn PDF document text
    • http://medgaj.com/61917419910e69q4.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/nofanojefajuneruvatimuvaw955j6.pdfIn PDF document text
    • http://xovebud.mygamesonline.org/zexilaganazexufa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://figupowogo.rf.gd/9207616942.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/prime_video_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/faxudumigakitupebuxemogoz.pdfIn PDF document text
    • http://zonavopom.rf.gd/35141489408.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_off0001026b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026B 5148 bytes
SHA-256: 36f0c8320da70196502173a90d41b358d80e2f0bcba0f985d2d10a1c67e37622
font_01_sfnt_off000113cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CC 11764 bytes
SHA-256: 79804339591ba0c88a46d2d74e6ba524ef8d6f4661c0d9358dba8285fa4f4dc1

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