Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f94bf3f4a2a6b97…

MALICIOUS

PDF

72.4 KB Created: 2021-04-02 07:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a0e246b013b14a5353fd26b34771ab03 SHA-1: 72d629e2fd95a15b5bdeb38852a13c2530956dd6 SHA-256: 8f94bf3f4a2a6b972d759101a9e66fdb4045b832f9ca8d75e910e18c1adbeeaf
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://nipisod.ru/award?keyword=just+and+yet+exercises+pdf PDF link annotation
    • http://legendbilisim.com/73593746473fi8ih.pdfIn PDF document text
    • http://zhigina.ru/maxuzofurojk2hk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375909/normal_5ffc705f41039.pdfIn PDF document text
    • http://startbastar.online/nepufemopodgfao.pdfIn PDF document text
    • https://poteluteko.weebly.com/uploads/1/3/1/1/131164474/kexamidiwetiditafak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449424/normal_5ff3d40eb9b6d.pdfIn PDF document text
    • https://dawoxojukuput.weebly.com/uploads/1/3/4/8/134890950/9223753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496193/normal_604f780e9a0cb.pdfIn PDF document text
    • https://jufesuzukexo.weebly.com/uploads/1/3/5/2/135294717/lamasatuvunebo.pdfIn PDF document text
    • https://zexotanus.weebly.com/uploads/1/3/0/8/130873712/kametowurixe.pdfIn PDF document text
    • https://wurivebufe.weebly.com/uploads/1/3/0/8/130874680/9706697.pdfIn PDF document text
    • http://cardioactiveufficiale.site/cfms_user_creation_form_biharziky7.pdfIn PDF document text
    • https://mipapipav.weebly.com/uploads/1/3/4/0/134012398/82118d146efff6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://901b9152-9067-49c5-8541-bb90c1a77dfa.filesusr.com/ugd/5d84e8_e81c7890cd63470c850b40a16b963cac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd054cc8-591a-4d4a-8243-5b616cb56cee/dir-655_wifi_password_reset.pdfIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_1a0158bceca0470b85619ee9fe5b5017.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/744e1a62-c384-462e-8c0b-45c5b38653b9/what_is_the_meaning_of_acceptance_of_a_bill_of_exchange.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66755309-b3dd-4b88-bfe7-8f1b94d80741/96296033408.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78d65997-902e-4b82-a785-5487628d64af/trane_cleaneffects_installation_manual.pdfIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_cb8a35bc6925439da77badfce07d77a6.pdf?index=trueIn 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_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 5276 bytes
SHA-256: 93609159bc924f1bbafcdbfb38d89ca93826c045def62ae9090e1ce1aa37d003
font_01_sfnt_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 10116 bytes
SHA-256: 894282754ee194800eeb97b5a33c229989bdf2017602bbffedcb7ee6213f5193

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