Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1a01f096154891…

MALICIOUS

PDF

104.0 KB Created: 2021-03-16 16:59:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1b0165be8cc0f0e0cdf5f762ffd95977 SHA-1: 26fab9504e046c802243ead13b8512ba512d1f01 SHA-256: fd1a01f0961548914b13023e17685a3adac0cf6898d23096e953222377a6c62a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to manipulate search engine results or direct users to phishing sites. ClamAV detection and ML classification strongly indicate this PDF is malicious, likely a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/123?utm_term=latter+days+movie PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368225/normal_60089d861ec6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462096/normal_5ff771e47a71f.pdfIn PDF document text
    • http://lulodexav.iblogger.org/pathophysiology_of_puerperal_sepsis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375528/normal_5fe255f10ffc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447669/normal_600480106e92a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_60270b26dffe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492875/normal_604e808930e95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464732/normal_5fe1426659a21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383128/normal_5fee2c851f37f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501364/normal_5fe04b1900e18.pdfIn PDF document text
    • http://kijuguwosaxo.22web.org/what_does_iron_curtain_mean_to_you.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_604778573fe38.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_6cc424702a0f44409cceafacc7a5c22a.pdf?index=trueIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_c96e162671f84705935ac0ef19b919e1.pdf?index=trueIn PDF document text
    • http://filawobabadi.epizy.com/what_are_the_elements_of_gothic_style_art.pdfIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_00b32229a03d42a8a55370611f8839dd.pdf?index=trueIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_ef8485d98ce74da2bf9504829e43f3c1.pdf?index=trueIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_445943bd416b4fa5840b209dc3e97a71.pdf?index=trueIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_e2b7c77892344c23a50d7b97c3e6fed0.pdf?index=trueIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_80813f80ab144e6a858b3bf3509f9f8b.pdf?index=trueIn PDF document text
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_69da1c3991a844dcbaebb6965b7b9079.pdf?index=trueIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_d5d70565c10949c79e491b33f9001832.pdf?index=trueIn PDF document text
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_752b7fe6359c4733a35169aff33219ba.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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000145da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DA 5040 bytes
SHA-256: a19f4acb7de77febcbe5d949bcb7df2f1c91eef8c1e584b35bbde0786589fd37
font_01_sfnt_off000156f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156F8 11296 bytes
SHA-256: 9cc91ed322afecac00745053cd0cebb8a0480213bcf4aaecb02ed03d51cd8b52
font_02_sfnt_off00017d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D2F 16192 bytes
SHA-256: 296b33a6e69ac3fa8ed420f1d1b401a0712a5a108b7c5c6efc73671719323d57