Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5514e041df1cc3e…

MALICIOUS

PDF

76.9 KB Created: 2021-03-22 07:15:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cdda8b28d1ba88a2515690deaac811e5 SHA-1: d28ce3c262597d752e83132eaca975524c6c3b87 SHA-256: a5514e041df1cc3ef5223ca213e707b64d14d6344c0878ac2a7878c37ea5ceb8
146 Risk Score

Malware Insights

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

The PDF contains malformed streams and numerous external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The embedded URLs point to disposable domains, further supporting a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://xezojetit.ru/award?keyword=colloquial+words+in+english+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370540/normal_600625d329a85.pdfIn PDF document text
    • https://tabajojimito.weebly.com/uploads/1/3/4/3/134317549/8196480.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405903/normal_5fee80c9d6d49.pdfIn PDF document text
    • https://munemajof.weebly.com/uploads/1/3/2/3/132302982/xodanav-zulezenewik.pdfIn PDF document text
    • http://rasazajafatirek.mypressonline.com/xuwuxakaxuli.pdfIn PDF document text
    • https://pevetuximamit.weebly.com/uploads/1/3/1/6/131606263/zabakutomisave-sasag-ravizolejavime-xutewujirewi.pdfIn PDF document text
    • http://mitisavad.getenjoyment.net/kofukafixeludomasokukipiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_603f019cace08.pdfIn PDF document text
    • http://wemorewabadeluz.mygamesonline.org/alphabet_anglais_francais.pdfIn PDF document text
    • http://kemikavar.mypressonline.com/phonetics_and_phonology_notes.pdfIn PDF document text
    • https://zikixitifo.weebly.com/uploads/1/3/4/8/134897390/1662474.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/how_do_i_change_the_time_on_my_panasonic_landline_phone.pdfIn PDF document text
    • https://kewidanuratug.weebly.com/uploads/1/3/5/3/135323433/fajenelasi.pdfIn PDF document text
    • http://fajafifog.mywebcommunity.org/ballou_logistica_administracion_de_la_cadena_de_suministro.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/jovekus/vomabub.pdfIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/america_the_story_of_us_bust_worksheet_answers.pdfIn PDF document text
    • http://subogerilazelo.atwebpages.com/49453838986.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/allodia._in_sambalpuri_dj_song.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/english_level_test_with_answers.pdfIn PDF document text
    • http://jewofeket.onlinewebshop.net/fipibiweritilazekurid.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_off0000ef06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF06 5428 bytes
SHA-256: 58fb84875eefd4258f6e9d62b0c8a61ade59d58c2ffbfe9779601c56172cd163
font_01_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 10908 bytes
SHA-256: 068ae87df19cff3fc975859a2aade774f78521d83a047257227845f53bbf2cb4

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