Malicious PDF — malware analysis report

Static analysis result for SHA-256 90173f7311a596ed…

MALICIOUS

PDF

82.7 KB Created: 2021-03-27 22:26:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 16fd01a18c7685d29222f584ea353c4f SHA-1: 54c38b0d87ed860336caad08439fad91f3136c8f SHA-256: 90173f7311a596edff1a5e777090489329b7e422b57c16236690dfe1339e6ec2
156 Risk Score

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 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://xajibur.ru/strik?utm_term=download+contoh+surat+lamaran+pekerjaan.doc PDF link annotation
    • http://giwudogor.scienceontheweb.net/50409536797.pdfIn PDF document text
    • http://zuxemesemubozo.mywebcommunity.org/sustainable_construction_green_building_design_and_delivery.pdfIn PDF document text
    • https://xitokudid.weebly.com/uploads/1/3/4/6/134688137/9978342.pdfIn PDF document text
    • https://lawaxiwutaf.weebly.com/uploads/1/3/4/3/134356413/pajavoxomitu_doned.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/radubozufiwo/how_many_book_pages_is_50000_words.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/subefumoviw.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/92562169181.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/all_in_one_er_apk_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/vasewekakovoroxuvexerez.pdfIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_345a399ea55b49178e8f582bfed4b624.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/18339637316.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/who_auditioned_for_the_notebook.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/tugiboruwanegiworesuwov.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/tebinojepuboxawosixofiliz.pdfIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_74f199315d7542d78c97487593346be7.pdf?index=trueIn PDF document text
    • https://f43304fd-85e4-489a-8612-81977e01be4a.filesusr.com/ugd/b6f504_33d8c7ae9a3546e18f796f5a2c8472d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jozetej/22654205178.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_off0000f88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 5408 bytes
SHA-256: 5337526c8b1e78e770dbdd26df268f8e94d4ee34a59d0bec5c1cb34d5da0749c
font_01_sfnt_off00010ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE2 10524 bytes
SHA-256: 0e4a9068279190311191a6bb41b28e5a9910784ea31a837cc8438c0089224c25
font_02_sfnt_off00012eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFF 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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