Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78d7adf6a3d6031…

MALICIOUS

PDF

71.3 KB Created: 2021-05-03 04:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13e57b5e7d6ad1b725e20915980503c7 SHA-1: 24a3399f8df7265d9e8ed764c803920e68324e5c SHA-256: e78d7adf6a3d60310421e415cf73fefaf8b77ab6a3e6b52ec2fd898e459d0869
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 it as a link farm. One prominent external URI points to 'https://kuzutuzo.ru/strik'. Another critical heuristic flags the PDF as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive external linking strongly suggest an intent to redirect users to malicious sites for further exploitation or phishing.

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://kuzutuzo.ru/strik?utm_term=free+prefix+and+suffix+worksheets+3rd+grade
    • http://xegazinijitup.mywebcommunity.org/76824438321.pdf
    • https://cdn-cms.f-static.net/uploads/4426832/normal_600ce66591052.pdf
    • https://cdn-cms.f-static.net/uploads/4476947/normal_606381eda3eb5.pdf
    • https://cdn-cms.f-static.net/uploads/4473049/normal_5fd218de93478.pdf
    • https://cdn-cms.f-static.net/uploads/4487927/normal_604ad9841e0e1.pdf
    • https://cdn-cms.f-static.net/uploads/4458163/normal_5fd28657c2619.pdf
    • https://cdn-cms.f-static.net/uploads/4412607/normal_604640391f6d1.pdf
    • https://cdn-cms.f-static.net/uploads/4365636/normal_606c05858f167.pdf
    • http://guparob.mywebcommunity.org/adjektiv_vningar_svenska.pdf
    • https://cdn-cms.f-static.net/uploads/4374373/normal_603a5c69bb7b5.pdf
    • https://cdn-cms.f-static.net/uploads/4453327/normal_6026ad2a604f2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zerejibixupav/treatment_guidelines_for_necrotizing_fasciitis.pdf
    • https://s3.amazonaws.com/zeworibuzoza/thiruttu_movies_2018_tamil.pdf
    • https://s3.amazonaws.com/sazomo/56956457257.pdf
    • https://s3.amazonaws.com/supefujoxopubu/plato_republic_book_5_analysis.pdf
    • https://s3.amazonaws.com/kosamupim/lojakivugavumuf.pdf
    • https://d4a58959-25bc-41ae-a48c-99f47e3c4711.filesusr.com/ugd/4dab1e_70c792d77e2641c9a615084ea4c0b41e.pdf?index=true
    • https://2bb9e989-9ce9-409f-aa8a-839f2ea8d3bf.filesusr.com/ugd/9f8cc2_71508457be3a40bc802c4ea5b739cec8.pdf?index=true
    • https://s3.amazonaws.com/tisegovofu/40154934200.pdf
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d69e.bin
64a304a2a15208e33f1e21a74ff95f8ec04c77e75e57b3f93be10d332575a4d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD69E 5616 bytes
font_01_sfnt_off0000e9da.bin
1ce6cf5ada63a19b9ef4a00d7ab80b585b7096da90981619966e6a9b73da2f4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DA 10564 bytes

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