Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87cffaa6988b3d0…

MALICIOUS

PDF

85.7 KB Created: 2021-03-27 12:13:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44a90174eca502996264b9e27de65373 SHA-1: 415c283740e60e7be7c04ef17611e2920743e500 SHA-256: e87cffaa6988b3d0024f4d848b7bb05ef3e80729b38451bfb0853bf4dd8f4b18
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious campaign, possibly involving embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=comment+pratiquer+l+autosuggestion+pdf
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/8255558.pdf
    • https://cdn-cms.f-static.net/uploads/4379722/normal_601e3c9a4f0ff.pdf
    • https://static.s123-cdn-static.com/uploads/4387408/normal_5fc8d48d98c3c.pdf
    • https://foseludi.weebly.com/uploads/1/3/4/5/134592848/4274953.pdf
    • http://lodulumadumaka.22web.org/xiwebelek.pdf
    • https://mofibowego.weebly.com/uploads/1/3/1/4/131406437/jowidefodakimuwu.pdf
    • https://rowegodidevonu.weebly.com/uploads/1/3/4/4/134468430/975498d06a22.pdf
    • https://cdn-cms.f-static.net/uploads/4404739/normal_6051970c5f02e.pdf
    • http://waranijovuv.sportsontheweb.net/nesobebeta.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rofuvawitarul.atwebpages.com/agilent_34401a_current_measurement.pdf
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_2fe9789ff06d4bfe99996b2055f6cccd.pdf?index=true
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_9b9493fca71b4eb18ed5c9e392e21580.pdf?index=true
    • http://boxakuwila.epizy.com/pompeii_ukulele_chords.pdf
    • https://s3.amazonaws.com/kezemiradigu/86897025949.pdf
    • http://mipuvofelope.epizy.com/53106086412.pdf
    • http://vobewegogiz.rf.gd/15097686688.pdf
    • https://s3.amazonaws.com/zerepuzuze/40625753699.pdf
    • https://s3.amazonaws.com/benuka/how_to_differentiate_between_bacterial_and_viral_pneumonia.pdf
    • https://s3.amazonaws.com/rimejiguvif/tahoe_2002_manual.pdf
    • https://7d33af4c-acfd-4996-9436-348e89828b5b.filesusr.com/ugd/289672_fc6dff0fd9b34e7f8f6b2723d82e6538.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f719.bin
7886ddc785e827b20e7b655dbf6e9cf2daecbd2a9cc6374b5034b3239bb3b3c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF719 5392 bytes
font_01_sfnt_off00010946.bin
4074981c2c6a1242091d8e642c5d133253d44dd4e4489053f7fa52b567c9253a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10946 12736 bytes
font_02_sfnt_off0001317f.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1317F 16312 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.