Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1eb1b7bbe24b44…

MALICIOUS

PDF

75.1 KB Created: 2021-01-13 14:18:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e88c9cd16b3904eeba05487dd523dd00 SHA-1: eeca34c94ac9971806c2cafa9515586e30e84475 SHA-256: ec1eb1b7bbe24b440a6205d2c74c71d8c8b17f64659bff16cd985eebe8d9747c
184 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 embedded links, with at least one pointing to known malicious redirector infrastructure. The document's structure suggests it is designed as a link farm to distribute traffic to various sites, likely for phishing or malware distribution. No scripts were extracted, but the presence of malicious links is sufficient evidence for the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://traffine.ru/aws?utm_term=android++image+from+url+and+save In PDF document text
    • https://site-1174103.mozfiles.com/files/1174103/hammer_it_smash_hit_meaning.pdfIn PDF document text
    • https://site-1166605.mozfiles.com/files/1166605/brain_fun_tricks_brain_test_brain_out_puzzles.pdfIn PDF document text
    • https://site-1083781.mozfiles.com/files/1083781/seviwafobubilu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409254/normal_5fcbd44c1ce12.pdfIn PDF document text
    • https://sebigazawipad.weebly.com/uploads/1/3/0/8/130814057/panipamezito.pdfIn PDF document text
    • https://getesuvuroxabet.weebly.com/uploads/1/3/4/4/134403663/govorazabexuwunefaba.pdfIn PDF document text
    • https://cdn.sqhk.co/zolaxadivowe/ST27OFY/domino_theory_cold_war_facts.pdfIn PDF document text
    • https://site-1166680.mozfiles.com/files/1166680/50_50_partnership_agreement_template.pdfIn PDF document text
    • https://tidatulo.weebly.com/uploads/1/3/2/8/132815220/ccb6198b090.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/hgcyghw/mavozewewizubopesofob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jifesu/1643458848.pdfIn PDF document text
    • https://s3.amazonaws.com/giwurode/goodman_fielder_annual_report_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/bedsheet_painting_ka_design.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_off0000da7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7C 5276 bytes
SHA-256: 0ceaa76da3876fbb8e9caa31d7b1674cb88f7acb99f126fee84af827729f74e3
font_01_sfnt_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 15584 bytes
SHA-256: 4c1ab694a37a4164364d0adb83d92c31a23b32b3139ab97fbf5685363c1306e1

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