Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a2066a792a24b6…

MALICIOUS

PDF

65.1 KB Created: 2021-02-15 10:40:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9f95f91f89b9d18d3ac10327a889178 SHA-1: 42476f7f251324aad47c8e0128b0137786265ddf SHA-256: 51a2066a792a24b6b6fee3a83b37b12be6cca779e74a8a0ac4e7efb755ad2fbf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, suggesting a link farm or redirection mechanism to host malicious content. The primary URL, 'https://bologen.ru/wix?keyword=inorganic+chemistry+4th+edition+solutions+manual+pdf', is presented as a search result for educational materials, likely a lure to entice users to click and download further malicious payloads.

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/wix?keyword=inorganic+chemistry+4th+edition+solutions+manual+pdf
    • http://moxufelomewiziw.iblogger.org/expense_report_uw_madison.pdf
    • https://static.s123-cdn-static.com/uploads/4376611/normal_5ff9097dd9b1d.pdf
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/349d1204fc3e.pdf
    • https://tureduritisamo.weebly.com/uploads/1/3/4/6/134676104/ruxafe.pdf
    • https://static.s123-cdn-static.com/uploads/4417029/normal_5ff21fe944256.pdf
    • https://cdn-cms.f-static.net/uploads/4427284/normal_602609da36a5b.pdf
    • https://womominajarizu.weebly.com/uploads/1/3/5/3/135392323/tijefejozituzeb_xexibaxa_pinizu_pejit.pdf
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/906febe7e7bf.pdf
    • https://sobidoduwipiver.weebly.com/uploads/1/3/1/4/131406433/xinodajijebiwitosifa.pdf
    • https://zojubexetiw.weebly.com/uploads/1/3/5/3/135316795/vasaji.pdf
    • https://talotemeve.weebly.com/uploads/1/3/1/6/131606578/8596477.pdf
    • http://lg-supportteam.com/thiruvilaiyaadal_aarambam_tamil_songs10r95.pdf
    • http://olivamebel.com/ponirukawujdhbzp.pdf
    • http://domavera.ru/zisogabuxadunosokazorex7291m.pdf
    • https://wefizaxire.weebly.com/uploads/1/3/0/9/130969527/9138813.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://turufefi.rf.gd/bahubali_part_1_tamil_songs.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_off0000c208.bin
a3887db266dba00ab33abb7824f70e3d1cec1a8e2734695b9c6edd8231009d24
pdf-font-stream PDF embedded font (sfnt) at offset 0xC208 5696 bytes
font_01_sfnt_off0000d54d.bin
abedac15dfa5e5e06b88e228107dda43ec943ccd2577cde43144660ea9a98408
pdf-font-stream PDF embedded font (sfnt) at offset 0xD54D 9892 bytes