Malicious PDF — malware analysis report

Static analysis result for SHA-256 555c2e00a0609df1…

MALICIOUS

PDF

75.4 KB Created: 2021-03-27 18:12:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ff8e80083ed76ec4359b285844fe7715 SHA-1: c27d0fb8c48fc4d4299d1ad54967093f864bda0f SHA-256: 555c2e00a0609df1df10c6f914c104f34db963dad979c02afadd208a49948969
156 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 0.9993

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://nipisod.ru/wix?keyword=amino+acids+are+joined+by+mcq PDF link annotation
    • https://duzufeto.weebly.com/uploads/1/3/4/7/134734580/jawewebarejasuzekox.pdfIn PDF document text
    • https://senidexug.weebly.com/uploads/1/3/0/7/130775540/juvevetekomivu.pdfIn PDF document text
    • https://bakusiluvusefe.weebly.com/uploads/1/3/5/3/135309983/zorijelu.pdfIn PDF document text
    • http://nubuxeki.scienceontheweb.net/remetegumurozinur.pdfIn PDF document text
    • https://tigasedoxopafu.weebly.com/uploads/1/3/4/7/134707490/dujudiz.pdfIn PDF document text
    • https://sivitudogadix.weebly.com/uploads/1/3/4/1/134108631/3474087.pdfIn PDF document text
    • http://fajamad.mypressonline.com/chave_do_windows_8.1_single_language_32_bits.pdfIn PDF document text
    • https://kakifiku.weebly.com/uploads/1/3/5/3/135347754/4d3effa2ce.pdfIn PDF document text
    • http://kepukarob.sportsontheweb.net/balance_of_payments_chapter.pdfIn PDF document text
    • https://kikobuvikivevir.weebly.com/uploads/1/3/1/4/131437815/a835cf.pdfIn PDF document text
    • https://gamajebijapam.weebly.com/uploads/1/3/1/8/131856653/tosaravoka.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/vonusirukete/97203574784.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/whatsapp_apk_windows_8._1.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/70283869270.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/5547482328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d04e3fb-87f3-459c-a3e8-00de351efc9a/52417374466.pdfIn PDF document text
    • http://fabevax.myartsonline.com/xojovatekorujozasujiv.pdfIn PDF document text
    • http://libejejizu.epizy.com/76552313546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e282abcc-c7fe-4cf1-bb9a-4b1b2df2cbb6/prentice_hall_gold_algebra_1_answer_key_form_g_chapter_2.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/lijamebuxefifexisamibale.pdfIn PDF document text
    • http://jojanotesejivi.epizy.com/paditureb.pdfIn PDF document text
    • http://lajovaputap.myartsonline.com/increment_and_decrement_operators_in_java.pdfIn PDF document text
    • http://lenepozomewu.epizy.com/idiomatic_expressions_worksheet_with_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_off0000e9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B8 5488 bytes
SHA-256: 33ccb3b0954f67961e6efbaf78e80912942af51f395be7f46f5290c44025370f
font_01_sfnt_off0000fc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 10448 bytes
SHA-256: ffbf1bc0136cf9a0767f6790434413b8946c20bcfc6c84bbbf5762fc4840b1fa

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