Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3150d9c0b67bcd…

MALICIOUS

PDF

78.6 KB Created: 2021-03-27 10:08:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 77e75c9d4d254e74876c4753f8c32aeb SHA-1: 989cb72360b99ab9a54956efa82b3961506aeb8e SHA-256: 6e3150d9c0b67bcdb5000d0ae9018357d79d0a69f96eb3f67f47bbb09494b18d
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, directing users to numerous external PDF files hosted on disposable domains, likely to distribute further malicious content or engage in SEO spam. The embedded URLs and the PDF structure strongly suggest an attempt to manipulate search engine results or lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gimoguvi.ru/award?keyword=abituriyent+jurnali+1+2020+pdf PDF link annotation
    • https://kifeketefisub.weebly.com/uploads/1/3/5/3/135347095/9012423.pdfIn PDF document text
    • https://subokolabipu.weebly.com/uploads/1/3/2/3/132303028/6738915.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486041/normal_6017157f22bd6.pdfIn PDF document text
    • https://fefefilax.weebly.com/uploads/1/3/2/7/132712664/2925594.pdfIn PDF document text
    • https://sekorora.weebly.com/uploads/1/3/4/8/134856449/421e54fe27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455881/normal_604e4f46b1e50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409604/normal_6013b31555c46.pdfIn PDF document text
    • https://wexapifunoru.weebly.com/uploads/1/3/4/7/134715363/nunugigaxufa_samesitipese_xodebit_pewanelosizop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370051/normal_6053e4b438cde.pdfIn PDF document text
    • https://retevewaluwur.weebly.com/uploads/1/3/4/6/134600892/pijubekegijes-zovoziwurep-lasewatanujogu-goxexij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477373/normal_604763976f63a.pdfIn PDF document text
    • http://fesuzeroba.iblogger.org/the_linux_programming_interface_by_michael_kerrisk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juzatapanosuwi.rf.gd/savupakegoxiziwipukifanes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5451bb75-671c-470f-b8c9-79271068d9d2/88203400485.pdfIn PDF document text
    • http://zinuruxe.epizy.com/28954293264.pdfIn PDF document text
    • http://rijewetevoxo.rf.gd/werejut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a190f439-aab1-42c2-9360-4f25664b1e0d/how_to_fix_automatic_threader_on_singer_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8d91ce2-4620-4614-93e5-e84071d4d6f5/sokudurulipuruzejip.pdfIn PDF document text
    • http://vikokaras.epizy.com/82032176794.pdfIn PDF document text
    • http://borinalujid.epizy.com/sotixurewinabuvubozanudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5004e8e-cc76-432b-a1c6-9132ff84254f/segijeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/375aec86-7388-4e71-b85d-e953a47593df/82877766157.pdfIn PDF document text
    • http://fitemis.epizy.com/sotuvevubogi.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF240 5492 bytes
SHA-256: 90c825a9565ab83a64ea21de7d58844750ad3fe4c76e99feb15741fb4f78e9c6
font_01_sfnt_off0001050f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050F 12324 bytes
SHA-256: f6f29403514a652287148bf2275b6d21e35df20eb633a7d995ddad1dbb4280d9