Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fcf1f18e2dc65a…

MALICIOUS

PDF

84.1 KB Created: 2021-02-28 23:57:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: c3ccd3e62cf1f23f19689bdc4ceb966a SHA-1: d9653ae6e358bf811948e30ebec3036635525a04 SHA-256: b5fcf1f18e2dc65a0a2d3be238df76ed64c2c43693d7495e60e34de86d00115d
166 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. It contains numerous links to external websites, with a specific heuristic flagging a link to an algorithmically-generated URL, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains keywords related to search terms, reinforcing the idea of a lure. The presence of multiple PDF_URI and EMBEDDED_URL heuristics further supports the attack pattern of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://resalured.ru/wix?keyword=extratorrent+proxy+2019 PDF link annotation
    • http://the-glow.ru/totetoripunavezapenovef5fqf.pdfIn PDF document text
    • https://pesuzipowezav.weebly.com/uploads/1/3/1/6/131636843/41154dcab.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/sifusekujetudemiwelolig.pdfIn PDF document text
    • https://gixunilaw.weebly.com/uploads/1/3/1/8/131856646/diwelijokijolup_memunefafa_taxuwewuw_vajixub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368954/normal_5fe25035b84fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_602053c7544f5.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/philips_system_one_cpap_manual.pdfIn PDF document text
    • https://gakujoxabusu.weebly.com/uploads/1/3/5/3/135394689/cc4c9d7e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_6016e0868c951.pdfIn PDF document text
    • http://leyloften.online/minecraft_1.12_mac_crackedno2jc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_5fe7463f4f5d3.pdfIn PDF document text
    • http://1green.space/1417841578222h31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392237/normal_60022538deac6.pdfIn PDF document text
    • http://goodnatural.space/vofilelumexifarosejafafivrzctx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabodegodonirad.atwebpages.com/how_to_make_beef_jerky_in_oster_dehydrator.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_off00010dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCC 5212 bytes
SHA-256: 62025df574469190e3f11ff62d992ea604e8b4282a71f77a2823d7180b1d75c7
font_01_sfnt_off00011fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA7 10444 bytes
SHA-256: b352a521282ba9ba2054612ac9df5e1612f14fb1ed3b1d303780cf3291d523c9

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