Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bec87f13dbdb1b4…

MALICIOUS

PDF

81.3 KB Created: 2021-03-24 22:09:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bf70cb3316c3b370a5d2b6ff83e8994d SHA-1: 5ba2924cab00810ee86155e3b1494624ea5fdfc5 SHA-256: 6bec87f13dbdb1b43f5059e65ef3835674a3764fc0f74acbe66b7bdb9f295da1
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting and are likely part of a link farm designed to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=cement+manufacturer+s+handbook+peray+pdf PDF link annotation
    • https://fagowegegex.weebly.com/uploads/1/3/5/3/135315381/zoxudenetu_kaxeriw_wifuzim_benopet.pdfIn PDF document text
    • https://cdn.sqhk.co/lisupixiwe/dhcpv9d/past_now_future_quotes.pdfIn PDF document text
    • https://cdn.sqhk.co/mosepoxik/eXJidge/my_boost_mobile_pay_bill.pdfIn PDF document text
    • https://xepudala.weebly.com/uploads/1/3/4/7/134737014/labidewovav_zofavogok.pdfIn PDF document text
    • https://dowolozudatu.weebly.com/uploads/1/3/4/0/134000293/bdb2c48f90a.pdfIn PDF document text
    • https://cdn.sqhk.co/vivokunavu/jhic9gf/777_casino_avenue_thackerville_ok.pdfIn PDF document text
    • https://balolenitazir.weebly.com/uploads/1/3/1/0/131071159/tepis.pdfIn PDF document text
    • https://tifimiwarefimi.weebly.com/uploads/1/3/4/8/134895051/74c9a03a2eb.pdfIn PDF document text
    • https://dunomomavelow.weebly.com/uploads/1/3/1/4/131407267/bedojusivilu.pdfIn PDF document text
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/7840005.pdfIn PDF document text
    • https://fisulujat.weebly.com/uploads/1/3/1/4/131454297/6690d2479f06b2b.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/1c6e2060-0cf3-48ac-81df-becde9cf9ac9/how_to_set_the_time_on_a_krups_savoy_coffee_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cf49f08-88ad-435f-a276-db8038d4c74f/mesakisogigafik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae73475d-a8ef-47a0-b2cc-2b61092c197b/adjusting_journal_entries_reports_in_quickbooks.pdfIn PDF document text
    • https://d4e9107b-ea7a-46dd-9434-10729a3140ee.filesusr.com/ugd/2e3df4_c33c68687af04e62b5ab6916b590f1ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a858f33-aad8-45f1-bb4f-8904d181adc0/pomutakuvunugelorezuwive.pdfIn PDF document text
    • https://cd65756b-a9c7-4cca-9498-1747a6459195.filesusr.com/ugd/05eb20_9ef8491a659e44a283c05fa062421f4c.pdf?index=trueIn PDF document text
    • http://fufudaloxola.onlinewebshop.net/example_methods_section_biology_lab_report.pdfIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_13dd4f61c0374c80a5a23f58820d372a.pdf?index=trueIn PDF document text
    • https://178fd8f3-986e-459b-a431-83c1f58eadb8.filesusr.com/ugd/7a8e82_146d700bf055458c9517022059012a15.pdf?index=trueIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_ee422c237b1a47409e03c3d96a1b294f.pdf?index=trueIn PDF document text
    • http://relivoziz.atwebpages.com/how_to_learn_android_programming_language.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_off0000ff23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF23 5572 bytes
SHA-256: 491358b04fc570f170cbc8acb09a857981461be6de65f49c3c2dc6fb76144708
font_01_sfnt_off000111ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 11184 bytes
SHA-256: abd8d21312983dcf9686c246fbe64f0b18fb2d168515819481dda0b603c45c65

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