Malicious PDF — malware analysis report

Static analysis result for SHA-256 c871356c8b4bce0f…

MALICIOUS

PDF

159.7 KB Created: 2021-03-20 02:49:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 56fb8747f1dbab2eaa1b2d12160628c2 SHA-1: fc94e9ffbda19b205c7b9b26d63d67785782be61 SHA-256: c871356c8b4bce0f2b0437b43ab76954d8f7f6340d2844269327636ed57ebcf5
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, references "Bleacher report top 50 list" and "wkhtmltopdf", indicating a deceptive pretext to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/123?utm_term=bleacher+report+top+50+list PDF link annotation
    • http://rumafelaneli.mygamesonline.org/download_ielts_reading_recent_actual_test.pdfIn PDF document text
    • http://yesitalia.fun/24172261099idabs.pdfIn PDF document text
    • http://raftgjgr.space/revenge_of_samurai_warrior_hack_apk_downloadpyfy2.pdfIn PDF document text
    • http://tesugujinarijag.mywebcommunity.org/beehive_textbook.pdfIn PDF document text
    • https://farevilifowo.weebly.com/uploads/1/3/5/3/135390938/ruripoda.pdfIn PDF document text
    • http://teren.fun/abinaya_song_free_mugen_rao0jvr9.pdfIn PDF document text
    • http://rasidafepu.mypressonline.com/emerald_tablets_of_thoth_doreal.pdfIn PDF document text
    • https://zulusoneruw.weebly.com/uploads/1/3/4/8/134887175/sagarerow.pdfIn PDF document text
    • https://balawuwugo.weebly.com/uploads/1/3/4/6/134622143/a7332bf487306.pdfIn PDF document text
    • http://fuguzelinufi.22web.org/best_non_aluminum_sheet_pans.pdfIn PDF document text
    • http://opit.space/malayalam_calendar_may_2018moqo3.pdfIn PDF document text
    • https://lekofubazag.weebly.com/uploads/1/3/1/8/131872104/zuger_xituwevop_dujem.pdfIn PDF document text
    • https://vejewumuwuwaja.weebly.com/uploads/1/3/4/7/134759129/galupa.pdfIn PDF document text
    • https://xofebigile.weebly.com/uploads/1/3/0/7/130739964/ferurizokavebu-zupulenekavijir-mugeji-nezeranefika.pdfIn PDF document text
    • https://bitivomo.weebly.com/uploads/1/3/4/4/134478942/4916699.pdfIn PDF document text
    • https://najigojuvunijo.weebly.com/uploads/1/3/0/8/130874658/sesepajevo.pdfIn PDF document text
    • https://tesudegijalel.weebly.com/uploads/1/3/1/4/131438759/vofovebixupidalutefo.pdfIn PDF document text
    • http://zovofuti.mygamesonline.org/beginner_esl_reading_comprehension_worksheets.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/wavunot/australian_tv_guide_melbourne_free_to_air.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/getotevubejevit.pdfIn PDF document text
    • http://kiwopej.rf.gd/pefanukogoxap.pdfIn PDF document text
    • http://rorazizaxaf.atwebpages.com/bosch_obd_1000_code_lookup.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_off000239be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x239BE 5336 bytes
SHA-256: 1966d4825d0501dbc895633970ffd03b4ed8abbedbabfd2e8f27192691b30b19
font_01_sfnt_off00024bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24BDC 10964 bytes
SHA-256: 095a7e9d2f59074c3caf8f709dc9c69811e0b0108c9935dd94240301e1166028

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