Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b54ddd484bb876…

MALICIOUS

PDF

76.6 KB Created: 2021-03-24 23:09:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e5bfc2b05560161eacaf54f1c366d318 SHA-1: d435a3129c02c1fa99d2b7b44242d4114434f317 SHA-256: b1b54ddd484bb87681645d0bc756e5cbb58d05afb9aec8ff899fde292111d301
244 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. It contains a large number of embedded links, many of which point to potentially malicious redirectors or disposable hosting, indicating a link farm used for phishing or malware distribution. The primary malicious URL identified is https://crophysi.ru/123?utm_term=dofe+gold+residential+assessors+report.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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/123?utm_term=dofe+gold+residential+assessors+report In PDF document text
    • http://parralax.net/158175326298zpp3.pdfIn PDF document text
    • https://miwolugakibu.weebly.com/uploads/1/3/1/3/131383652/wodetiza_jitokaj.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/molelejobavamefokos.pdfIn PDF document text
    • http://prizinsta.info/1457929219ahgen.pdfIn PDF document text
    • http://setofexperience.site/f-_stop_gallery_reviewf4afj.pdfIn PDF document text
    • https://lumixomenuvaw.weebly.com/uploads/1/3/4/7/134745504/cc372b85d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfcf460b-2eca-4319-b306-b066a2945678/sixixe.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/online_payday_loans_cash_same_day.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/kebewetuwosafilak.pdfIn PDF document text
    • http://makovetesilo.rf.gd/cgeit_review_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbce6b54-7efb-45ac-a2a2-68654aa64ed8/samsung_rf268abrs_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a890b4a-3a60-4387-b932-7c599dbecf26/tp_link_wr841n_manual.pdfIn PDF document text
    • http://xesidif.epizy.com/96139504925.pdfIn PDF document text
    • http://vedetav.rf.gd/tajunegu.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/masuvitupisiretizevo.pdfIn PDF document text
    • http://biziwinajivo.rf.gd/78163676760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e4149c-028f-47c8-b565-dab12a0b1df4/algebra_1_common_core_textbook_free.pdfIn PDF document text
    • http://vilobeve.rf.gd/37811150100.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/71170124358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7289d6f1-d0dd-441c-bfa1-460da8d1f291/elder_scrolls_online_best_character_creation.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/surgeon_simulator_aptoide.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_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 5208 bytes
SHA-256: de0fab8db0edd1ff77abd8852239edd9c61f7cde6999a4fc492f4afefcd17830
font_01_sfnt_off0000ff38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF38 10860 bytes
SHA-256: d5655305b6506a8091b4652759b8e9cd8752999e7da7546e798e062356bcd513