Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d644d8f4d412867…

MALICIOUS

PDF

76.0 KB Created: 2021-02-20 12:06:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 16c428dae69cd31aae463dea0bf9fc92 SHA-1: b8394805ab9a807906f24216223eafde93b1f548 SHA-256: 8d644d8f4d412867348db8718e187fb779133cc2598fee178f4da384e22124d7
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, includes text related to 'Evod battery blinking while charging', likely a lure to entice users to click the malicious links. The presence of multiple disposable domains and link farming techniques further supports a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://yafferge.ru/123?utm_term=evod+battery+blinking+while+charging In PDF document text
    • https://debarinibew.weebly.com/uploads/1/3/0/7/130775297/e470c7e377603.pdfIn PDF document text
    • http://smirno.life/276155091063c8vf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_600df84f90256.pdfIn PDF document text
    • http://rasprodavaika.ru/88632344941isu9m.pdfIn PDF document text
    • http://procripton.com/72947316213ltzsl.pdfIn PDF document text
    • http://domainlimax.xyz/betewedagafuzofexakij686xv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374540/normal_602196d0f20a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448984/normal_5ffdfae6a188a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376866/normal_5fe942f5c12c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385848/normal_5ff43101f1ddd.pdfIn PDF document text
    • http://ruszaimclub.ru/joboviltmoaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417226/normal_5fc7d745d4063.pdfIn PDF document text
    • https://bojepelesu.weebly.com/uploads/1/3/5/3/135350442/a64a5c758f2c237.pdfIn PDF document text
    • http://it50life.pro/hp_officejet_j4680_all_in_one_power_cordk2ohi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446930/normal_602c0c847b1b9.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/fadedosi/wibik.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/spotify_premium_offline_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/femadajegejijot.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/63754774069.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_off0000eb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4A 5440 bytes
SHA-256: 68d895bcafeaa3845fe48c3d08201411a1b1408ae64117385bceaebe5b132e98
font_01_sfnt_off0000fde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE5 10832 bytes
SHA-256: d4c1c3b6711f0a43748726151c2621e80433757d706dc7fcfb7948fc7c7f5752

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