Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19fd4aa9c4040b8…

MALICIOUS

PDF

76.2 KB Created: 2021-02-11 02:15:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: d29051e11ce47dba82ceeb528026dc4d SHA-1: 3c86112eee33caa43d5878c03bb10a042742f1ed SHA-256: d19fd4aa9c4040b8a6ebb3d3b90c136e94cb5b9d7f86df3d8ebedde28227028a
324 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/wb?keyword=best%20free%20comic%20book%20reader%20for%20android In PDF document text
    • https://cdn.sqhk.co/zesonixiv/hifIVn2/lezofekimazipikidupob.pdfIn PDF document text
    • http://xojuxegalixiluj.66ghz.com/zebupunaxiromamajat.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/semegolavutujepagaliza7a91p.pdfIn PDF document text
    • http://businessoutsourcing.info/76356514836ly3mr.pdfIn PDF document text
    • https://kodidorimo.weebly.com/uploads/1/3/1/3/131380292/9c8e02802.pdfIn PDF document text
    • https://vivazezege.weebly.com/uploads/1/3/4/0/134041722/biwudegif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476751/normal_600549c965d6b.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/ibjiTgh/bricks_breaker_infinity_mod_apk_unlimited_money.pdfIn PDF document text
    • http://fallofelin.online/sewubisimozasakefajimifotqxdql.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/Nbjeia7/tudax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421365/normal_5ff68bf40e94c.pdfIn PDF document text
    • https://cdn.sqhk.co/tejosepu/dBZiLVZ/29856821373.pdfIn PDF document text
    • http://leoidet.xyz/shogun_rua_vs_nogueira_3nm654.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366374/normal_5fc95d7750a1c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://latowetutut.epizy.com/97876915179.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_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 5388 bytes
SHA-256: 1aad7d5b548fadb882a75d82011aa701fbd3e623f4f98be12abe5e7bcb3030a9
font_01_sfnt_off0000ffad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAD 10644 bytes
SHA-256: d4277b4c93639a051e2f6d1b558d8209d8b9ea82a51507800a52501275e8afea