Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec53cfd7cc0b1fe7…

MALICIOUS

PDF

76.6 KB Created: 2021-05-15 04:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ca8771d548f662de835edb1f9456d3c0 SHA-1: 20988909ce8515e9bf9e9e95f6a755967a1a1b37 SHA-256: ec53cfd7cc0b1fe740a3eccb477e4e1ab327e20c32882ec4329f4baf29cd130f
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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/strik?utm_term=sennheiser+rs+160+rf+wireless+headphones PDF link annotation
    • https://tureduritisamo.weebly.com/uploads/1/3/4/6/134676104/2310787.pdfIn PDF document text
    • https://biwamuneluzotip.weebly.com/uploads/1/3/2/6/132696598/8ea4f04b0.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/c9hejfH/last_football_coach_to_wear_a_suit.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/902e325c67642.pdfIn PDF document text
    • https://nefolebar.weebly.com/uploads/1/3/4/4/134400051/859225.pdfIn PDF document text
    • http://ejinaya.com/pokemon_insurgence_rom_mobiley7y0e.pdfIn PDF document text
    • https://cdn.sqhk.co/nizidevogaka/ibV40hd/41170558789.pdfIn PDF document text
    • https://revivumusemob.weebly.com/uploads/1/3/5/4/135400225/a8865c1e603.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/72379083722fmpiv.pdfIn PDF document text
    • https://nekewagan.weebly.com/uploads/1/3/4/8/134881830/batefobezibilif-pesomer.pdfIn PDF document text
    • https://feronokemafa.weebly.com/uploads/1/3/1/1/131164109/nimirumibiwil.pdfIn PDF document text
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/42517919a62.pdfIn PDF document text
    • http://matcobzor.ru/what_is_the_theme_of_the_giver_in_chapter_127b4b.pdfIn PDF document text
    • https://gitexapovaje.weebly.com/uploads/1/3/4/4/134464395/8b7b02.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/tajimipojimo/caligula_s_horse_in_contact.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/wework_annual_report.pdfIn PDF document text
    • https://04fc2a56-3ca8-4b90-bfe8-b05f9e7ed3d8.filesusr.com/ugd/51e9d0_b45eaa218ff64f0dbf4f94b2992b2612.pdf?index=trueIn PDF document text
    • https://636e06b3-920c-4898-b827-ef778bbbc101.filesusr.com/ugd/40512e_e59e44e291b141e3b8148beb66362b3c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gusule/wiggle_whistle_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/fundamentals_of_statistics_5th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/beyblade_burst_god_nintendo_3ds.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_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 5672 bytes
SHA-256: 4308d18713df6ded920447eb7c61f55027b7f6bfa858b2da522bc5a09efbff4f
font_01_sfnt_off0000fee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE8 11188 bytes
SHA-256: 4bdade7571c9142df6cbb614ec9dec951ce7793fcd7fd45f47149100c98d24c0

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