Malicious PDF — malware analysis report

Static analysis result for SHA-256 6604f575bcd653f7…

MALICIOUS

PDF

83.9 KB Created: 2021-03-21 11:32:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6337645f769e98fd015814b66d7dd575 SHA-1: e98189734db1f164e96a3bf17eaf3fa305065c95 SHA-256: 6604f575bcd653f771b911b132076b5fb2593b769afaa6ec96cc286408feac2e
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a link farm and potential phishing/trojan distribution. The embedded URLs, particularly the one on 'soxebez.ru', suggest an attempt to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and its association with link farms indicate a likely intent to drive traffic to malicious sites, possibly for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://soxebez.ru/award?keyword=calistenia+plano+de+treino+pdf PDF link annotation
    • https://ranibifuvif.weebly.com/uploads/1/3/1/3/131381542/sabegadelelor-nomobonamulaze.pdfIn PDF document text
    • https://jerupixudenaxi.weebly.com/uploads/1/3/1/4/131437293/9387a1.pdfIn PDF document text
    • https://muxetomanudone.weebly.com/uploads/1/3/1/4/131406273/4e7f3c34a4ff329.pdfIn PDF document text
    • https://bumufufumobumag.weebly.com/uploads/1/3/2/8/132815806/9b2124af0c056bb.pdfIn PDF document text
    • https://zewemoledomuro.weebly.com/uploads/1/3/4/7/134746436/gajebu.pdfIn PDF document text
    • https://jexisaguratoka.weebly.com/uploads/1/3/1/4/131409442/352386418.pdfIn PDF document text
    • https://xokaxopo.weebly.com/uploads/1/3/2/3/132302824/nexonezijipatak.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/kezijafaxodulem-rilopizu-vujederil-fepofegazatomuv.pdfIn PDF document text
    • https://jadojojipolukot.weebly.com/uploads/1/3/5/3/135337887/tusigotod_wupaxaboxigis_kuboroje.pdfIn PDF document text
    • https://vogadebu.weebly.com/uploads/1/3/4/7/134723944/zagebizew-suwejope-dobedutafedat.pdfIn PDF document text
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/96fa185dbd.pdfIn PDF document text
    • https://sifapovidajep.weebly.com/uploads/1/3/0/7/130738911/9392348.pdfIn PDF document text
    • https://gufonalika.weebly.com/uploads/1/3/4/0/134096228/puzawuvej-tiwosi-dafuliduwaxufot-doboma.pdfIn PDF document text
    • https://pulapiselipatux.weebly.com/uploads/1/3/1/3/131378970/0d91ed5fa427.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/43c1c449-9e2d-4692-99a3-4401e61eb9f8/3656073850.pdfIn PDF document text
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_c8fd125da0e04b709501b4bed476ee38.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b638a125-f023-47f4-8af2-a63301b839b1/dafefonawupipugex.pdfIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_a1ca2fb34d4f44a6b84d96ce061dab67.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/52778877422.pdfIn PDF document text
    • https://dce579ed-4708-43c3-aaeb-2c76a6268d78.filesusr.com/ugd/944939_af6459827419473db690e10a8e339052.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/5554821319.pdfIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_1225a339b56b40de9f64455a8d4de042.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f5a1a36-516e-4d52-978b-24c59d83a751/toyota_camry_2019_sport_black.pdfIn PDF document text
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_990f41e3a377460a86f1b45599840071.pdf?index=trueIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off00010837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10837 4940 bytes
SHA-256: 76d70168ad5215696933b816f82d93ccad0992b3c367b5ecd980492214be72b4
font_02_sfnt_off0001190c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190C 12044 bytes
SHA-256: bca2f5757bf8785ed5818af1df0d84725cd0d11c13c5fa5919c5748e2950ea9b

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