Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb986c61017993c3…

MALICIOUS

PDF

89.3 KB Created: 2021-04-03 15:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 596e63e5d18060bf81b078ddc20621ec SHA-1: d6affb78cdb5d47123cf3b3d6281d4a27a3cffd4 SHA-256: fb986c61017993c3aa69fa29a38e2e836f720f9a4b93f92b0ec44f2d5387e6f8
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://jumiwimov.ru/strik?utm_term=presidential+book+of+secrets+national+treasure PDF link annotation
    • https://sagisumofag.weebly.com/uploads/1/3/4/8/134882066/lonivazele.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421778/normal_5fdeefe259a5a.pdfIn PDF document text
    • https://vokefepafox.weebly.com/uploads/1/3/4/3/134333292/7201213.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/bicol_history_and_culture.pdfIn PDF document text
    • https://duzetokip.weebly.com/uploads/1/3/4/4/134404829/revaladadujelol_gufat.pdfIn PDF document text
    • https://juvikawupuw.weebly.com/uploads/1/3/1/4/131409017/mubopixam-xomigijodejomew.pdfIn PDF document text
    • http://tevituvodejifep.mywebcommunity.org/rural_certificate_format_in_english.pdfIn PDF document text
    • https://bulumivivowusip.weebly.com/uploads/1/3/4/6/134667270/diviguda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449004/normal_6054e0443ad88.pdfIn PDF document text
    • http://naliputa.mywebcommunity.org/79817570689.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tonavisuma.onlinewebshop.net/will_argyle_diamonds_increase_in_value.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/burak_yeter_tuesday_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/fuviseramilap.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/99969789245.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/37735919334.pdfIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_fa15d7c13bd1424ba335b06584b927be.pdf?index=trueIn PDF document text
    • http://noxumalog.onlinewebshop.net/jugobifodat.pdfIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_bd0db8fc02ec4e8cb302f4ce4ea68743.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutogugej/69575815345.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/what_size_are_clipper_guards.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/nupijutezeredenu.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_off00011d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D94 5220 bytes
SHA-256: f3d04a8475865cae0e76caeec46c255caee326afc9116551a4f938be4d102883
font_01_sfnt_off00012f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F61 12044 bytes
SHA-256: af5b8ec92185da9edee515be3b055e52ff131becbde4bc802fa55f3438a49720

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