Malicious PDF — malware analysis report

Static analysis result for SHA-256 952e3be9ab8fbb76…

MALICIOUS

PDF

80.7 KB Created: 2021-03-18 09:09:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: de0cbae7e85b3a4be5a6f6b2a9ffd3e1 SHA-1: c6d0b7ac794239e6834ecaaba27840d46533b1eb SHA-256: 952e3be9ab8fbb76b741a2709f88644303c053e507f71121af1bed8324af4d51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a critical heuristic identifying a link farm. The primary URL, https://vilenefex.ru/wix?keyword=3-3x6%252B2%253D+correct+answer, is presented alongside a math problem, suggesting a phishing or scam lure. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vilenefex.ru/wix?keyword=3-3x6%252B2%253D+correct+answer PDF link annotation
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/3150175.pdfIn PDF document text
    • http://kakorixow.mygamesonline.org/how_to_connect_wd_my_cloud_to_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418963/normal_5ffea7918b44c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382976/normal_5ff9cb618e89e.pdfIn PDF document text
    • http://wugupomovupa.sportsontheweb.net/22647997209.pdfIn PDF document text
    • https://fuvipizewovotat.weebly.com/uploads/1/3/1/0/131069886/xuxoj.pdfIn PDF document text
    • http://sowakowakemim.mygamesonline.org/83563310308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_6013492a6e18f.pdfIn PDF document text
    • https://bokirises.weebly.com/uploads/1/3/1/6/131607331/07ea00c909.pdfIn PDF document text
    • http://xivobivivupe.mygamesonline.org/denebagaz.pdfIn PDF document text
    • http://maxobujixeweden.sportsontheweb.net/xugofemexasebi.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/bonfiglioli_vectron_agile.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
    • http://molagegivijoxu.onlinewebshop.net/posesawororojinulag.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/cub_scout_tiger_den_leader_guide.pdfIn PDF document text
    • http://biwosagamivi.myartsonline.com/21921412106.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/ccleaner_free_piriform_gratuit_franais.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/potot.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/95912809396.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/37542896535.pdfIn PDF document text
    • http://pefimubis.myartsonline.com/13160967284.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/chale_aana_song_ringtone_bestwap.pdfIn PDF document text
    • http://zedowep.atwebpages.com/how_to_test_uv_flame_sensor.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/marigever.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/biblia_de_estudio_esquematizada_reina-valera_1960_online.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/floral_bassinet_sheets_australia.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CC 5092 bytes
SHA-256: 972c9599e2080d148a5b4c9b0d6df5a5a47fadfad633f2c976db9132c66ad4f8
font_01_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off000100ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AB 11096 bytes
SHA-256: f68e92e575cec3e4eb8b251e3d0a4ee81f3d87f298bc8f1502bf096bde8f017f
font_03_sfnt_off00012688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12688 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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