Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae6e6bd883523b18…

MALICIOUS

PDF

81.5 KB Created: 2021-02-15 15:37:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: dfa123fe15f378259f7512f8ef75d236 SHA-1: c3f98146ae840bc8815568f36259a643d023959c SHA-256: ae6e6bd883523b1886149b24445269851d69cad532a4833bed093ba7f8d2bae1
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, many of which point to disposable domains or known malicious redirectors. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to phish users or lead them to malware download sites. The document body appears to be garbled, suggesting it's not intended for human consumption but rather to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=discourse+on+the+method+of+rightly+conducting+the+reason+and+seeking+truth+in+the+sciences+pdf In PDF document text
    • https://cdn.sqhk.co/jorisuzil/hbSjelr/ice_hockey_jerseys_custom.pdfIn PDF document text
    • https://bigufoxorifef.weebly.com/uploads/1/3/1/8/131871864/029ac34392.pdfIn PDF document text
    • https://wisejagu.weebly.com/uploads/1/3/4/8/134881465/laxonaroxidiful.pdfIn PDF document text
    • http://anyita.space/27424530916cjrae.pdfIn PDF document text
    • http://genusttwsr.fun/lifakifncqs.pdfIn PDF document text
    • https://lodikesilir.weebly.com/uploads/1/3/4/8/134868057/gamis_gokemigoxa_polax.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/vekiranugow.pdfIn PDF document text
    • http://frontglass.xyz/51032126327htoej.pdfIn PDF document text
    • https://biramufon.weebly.com/uploads/1/3/4/7/134775887/8362035.pdfIn PDF document text
    • http://return-0.com/allegiant_downloadnwo0i.pdfIn PDF document text
    • http://wavakidagipav.iblogger.org/lancashire_teaching_hospitals_board_report.pdfIn PDF document text
    • https://girezerel.weebly.com/uploads/1/3/1/0/131070389/5ac705.pdfIn PDF document text
    • https://kezobonuduwu.weebly.com/uploads/1/3/4/4/134457579/8490895.pdfIn PDF document text
    • http://iwhite.space/lozenimujakiralgry9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuwugufufokiti.epizy.com/scratch_for_windows_7_32_bit.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_off0000fd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 5732 bytes
SHA-256: f7a38780a39cd68d5c3331349d7b161d6c4729a2ec134103cb42d27a56454ce6
font_01_sfnt_off000110c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C6 11152 bytes
SHA-256: 1b884664d1fadd0b9ec871f7b87202c2c3c70d6b4bd7035e3b112c34cfb61910

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