Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac90335bca891ee…

MALICIOUS

PDF

90.7 KB Created: 2021-03-29 04:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a6ee33b4e41accc7577219bc3b048947 SHA-1: 84089500d5f5c83da0e0c70413bdf5c0a054db53 SHA-256: bac90335bca891ee92a53f209b835948587045e26bccd1b8bb1e8c0c2893e6fb
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 0.9990

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://midufefew.ru/strik?utm_term=particle+physics+definition+energy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490125/normal_6043360765915.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/Lhbhi29/57138045364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371791/normal_604cedc13b6b6.pdfIn PDF document text
    • https://cdn.sqhk.co/jirowolad/hjhf6pX/23081627003.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/16s5fb1/23808771477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387810/normal_6031c051235d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452852/normal_6042055147674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452862/normal_6059ac3fc3a54.pdfIn PDF document text
    • https://cdn.sqhk.co/pipujevi/jj5ifVP/square_painting_frame.pdfIn PDF document text
    • https://cdn.sqhk.co/wetilusogaki/jiamjjN/lisixekubitopifulor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501993/normal_602837b2ce228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478415/normal_60531de552a6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368477/normal_6046b7c5266b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377380/normal_6046e4c19cf33.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/dhbjfpQ/zevabubejun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wutisigila/what_another_word_for_study_hardest.pdfIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_d51dd90be0804fc59052aed6d19de702.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lupebesu/epicrisis_report_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/how_to_increase_your_vertical_jump_quickly.pdfIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_811baba6b38444479fe4667c36c00717.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_c59be65ca65f40eb8af53f6757ab8efd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivamubug/sexidevajokitemupob.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/97061075285.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116ED 5308 bytes
SHA-256: 44dd4b1c799659fc5eacf07fd1e6919a7ca0dbdfe8f66c62411a1d80ca4d5262
font_01_sfnt_off000128ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EC 10608 bytes
SHA-256: 455e9095dd93c1056e92d2dacbf8780963049225941a90ed03fae221cf990734
font_02_sfnt_off00014d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D00 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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