Malicious PDF — malware analysis report

Static analysis result for SHA-256 4871277e73f03ba9…

MALICIOUS

PDF

73.8 KB Created: 2021-02-26 18:23:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a8d76e05c22ecf39512ea3ee0326d3c9 SHA-1: ab9ab7f1d718e5aeec6df918a063396f1a6fdde9 SHA-256: 4871277e73f03ba9690a5826e4ff51806b2eebe6bf12fcb6bd2e957539861fc3
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 0.9997

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://maypoin.ru/123?utm_term=perseus+slaying+medusa+tattoo PDF link annotation
    • https://gitapelo.weebly.com/uploads/1/3/2/6/132682700/9201612.pdfIn PDF document text
    • https://fudukonuxevefez.weebly.com/uploads/1/3/4/6/134606022/9595900.pdfIn PDF document text
    • http://allerop.xyz/unravel_me_sabrina_claudio_letrauvvm8.pdfIn PDF document text
    • https://matomuzunoto.weebly.com/uploads/1/3/5/3/135389802/gopalowur.pdfIn PDF document text
    • https://cdn.sqhk.co/fofesali/hjfgi0k/65032972941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379486/normal_5fe92fb1e8aeb.pdfIn PDF document text
    • https://lunipudazu.weebly.com/uploads/1/3/4/4/134462877/jupiza_subusofimaxara_bibezudawokipir_pejutesipiriler.pdfIn PDF document text
    • https://cdn.sqhk.co/movozuba/jIXaia5/fezofig.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/pc8iaDj/kifope.pdfIn PDF document text
    • https://cdn.sqhk.co/divoxisig/heicgid/muzeraxamewukabitobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451039/normal_6014d182a1be2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369916/normal_5fc83ade677fd.pdfIn PDF document text
    • http://cashfree.store/epic_seven_wind_rider_before_nerfqdxj5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409814/normal_602768f62467e.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/jezekemunidup/43947510877.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/buildbox_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/chemistry_the_central_science_laboratory_experiments_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/20301101382.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/bobomilerudatazemine.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/ranzcog_prenatal_screening_guidelines.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_off0000e55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55E 5248 bytes
SHA-256: cc0ba297b506d4077a84d5eb0958038ead4fd1bed5ccaf36ddab90456a16099d
font_01_sfnt_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 10380 bytes
SHA-256: 5e3efc316857a8c5c48e3379cfca5e32c6b31d2a1b383aa36ba0c6329aa284d1

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