Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5479c5525b2cc4…

MALICIOUS

PDF

78.4 KB Created: 2021-02-16 11:22:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5122c132592c9dc5fc9721dfb9c17849 SHA-1: 40bd2dd70e8678add31180367a64a3f1df44788f SHA-256: 5f5479c5525b2cc491efa02642cd15c826c65511764467837edf119b4f197b80
304 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits malicious characteristics, including links to known malicious redirectors and a link farm hosted on disposable infrastructure. The document body, though obfuscated, contains text related to financial transactions and a lure for recovery secrets, indicating a phishing or scam attempt. The presence of multiple embedded URLs and the ML classifier's high confidence score further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+short+bitcoin+on+etrade In PDF document text
    • http://vezizulavojunif.22web.org/bakery_business_plan_examples.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447108/normal_60035d51d36c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484993/normal_601a6f8a1edd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380883/normal_5ff515a4f1621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477658/normal_5fdb95f9c04f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403807/normal_5ffd651f28a5f.pdfIn PDF document text
    • https://zegekeli.weebly.com/uploads/1/3/4/6/134616407/gonenobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5fd71352b0d8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385887/normal_60254b4b4a5fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5fd63b5802cc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380223/normal_5fd6d4812bfbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462696/normal_60231a54dc5ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385207/normal_601185afd791e.pdfIn PDF document text
    • https://rixijufufapug.weebly.com/uploads/1/3/4/4/134497528/sodoze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suwuxuk.epizy.com/khatu_shyam_baba_video.pdfIn PDF document text
    • http://jetumodegupejit.rf.gd/75143605835.pdfIn PDF document text
    • http://kifofok.epizy.com/zujidutakevozumupedej.pdfIn PDF document text
    • http://laniferes.epizy.com/satyanarayana_biochemistry_free.pdfIn PDF document text
    • http://vezapuro.rf.gd/kugafapuvini.pdfIn PDF document text
    • http://watenumedar.rf.gd/91982254237.pdfIn PDF document text
    • http://wolaniloko.epizy.com/todojifobenozinipukixubu.pdfIn PDF document text
    • http://jagogapibibolin.epizy.com/hearthstone_boomsday_project_mirror_guide.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_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 5188 bytes
SHA-256: 6fb529635b9dd87065ac8913d6e117d87615673a3da11fed1f10eef4f2ac648b
font_01_sfnt_off000107b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B5 10724 bytes
SHA-256: 81125bbc5238463c4226027c27a7bd5bb5fdb50d10bc8d1a35b2cfc5a901f1a3