Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a41a5488b51299…

MALICIOUS

PDF

76.6 KB Created: 2021-04-15 22:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 010edb2b65e967c7e47031ade856bf3b SHA-1: 1de844f16a1a8ecbfbdbfb2822028fa51f942443 SHA-256: a7a41a5488b512996147276bf6d92fc8570aeec2e014101dd237ab0bff4fdaef
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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
  • 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://xajibur.ru/strik?utm_term=how+to+ace+pa+school+interview+book PDF link annotation
    • https://ruritavi.weebly.com/uploads/1/3/3/9/133988031/nodex_xikebow_riwofif.pdfIn PDF document text
    • https://xizimojagetotom.weebly.com/uploads/1/3/3/9/133997363/2ac6f184fc1887.pdfIn PDF document text
    • https://webunufilijamo.weebly.com/uploads/1/3/4/6/134677486/lubusulela.pdfIn PDF document text
    • https://galomitazede.weebly.com/uploads/1/3/4/7/134748449/bofetifip.pdfIn PDF document text
    • http://samettemiz.xyz/adobe_package_price_for_macv7uei.pdfIn PDF document text
    • http://batut.space/fezawixajisawedusuk55oy.pdfIn PDF document text
    • http://remontnatali.ru/what_is_the_best_cloud_storage_for_iphoney65cj.pdfIn PDF document text
    • http://pushbiz.fun/55271121769up0yo.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/3418656.pdfIn PDF document text
    • https://biditeso.weebly.com/uploads/1/3/4/3/134339176/senalis_deripotisur_jowesovugagaj.pdfIn PDF document text
    • https://gitesadikelipa.weebly.com/uploads/1/3/0/7/130776331/902231.pdfIn PDF document text
    • https://jawenovexexadu.weebly.com/uploads/1/3/4/0/134012785/52f2cafa3.pdfIn PDF document text
    • http://daravto18.ru/pokemon_sword_strategy_guide_downloadwe7bv.pdfIn PDF document text
    • https://ximetekorexuven.weebly.com/uploads/1/3/4/4/134489871/3287182.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/440e78e4-d5ac-470f-8007-a51dc7eea5fd/stewart_calculus_early_transcendentals_solutions.pdfIn PDF document text
    • http://lozekav.epizy.com/us_navy_aviation_boatswains_mate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2547d9b-7350-4a10-8093-bbe6a502139a/jekidoxud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6b4fb90-a7a5-4bdc-86b3-ef3fd4e57049/does_toshiba_smart_tv_have_android.pdfIn PDF document text
    • http://vagakidid.epizy.com/operational_auditing_principles_and_techniques_for_a_changing_world.pdfIn PDF document text
    • http://dikekonigexixa.epizy.com/medical_terminology_chapter_1_learning_exercises_answers.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_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 5336 bytes
SHA-256: 18437e71fccbbebc346ec4a0b3773960c20af776fb81b80cc558319afbd3b44b
font_01_sfnt_off00010053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10053 10748 bytes
SHA-256: a72991d50ef9c8ea98c2eed2835d2483023d59f7d372e60e2187e27839803c23

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