Malicious PDF — malware analysis report

Static analysis result for SHA-256 983f53556ee913a6…

MALICIOUS

PDF

103.0 KB Created: 2021-02-15 09:23:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2db7f24f52017a9dcaa9af7fbe6442a3 SHA-1: ed51c85247b20f9b79162bd2c20bdf874325b573 SHA-256: 983f53556ee913a6408c6f5820caa848efb220741779966b7e42db6118e51ef2
244 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many pointing to disposable domains and redirector infrastructure, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the primary attack pattern is the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/strik?utm_term=easiest+way+to+learn+thai+alphabet In PDF document text
    • https://cdn.sqhk.co/jimumakevaji/icBhe4P/raxawamupotex.pdfIn PDF document text
    • https://dinijituwit.weebly.com/uploads/1/3/1/6/131606252/3762189.pdfIn PDF document text
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/guwirabijagodixawasi.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/hdsrjtX/weird_mma_fighters.pdfIn PDF document text
    • https://cdn.sqhk.co/perajomipe/gewhbgj/cashback_offer_in_amazon_pay.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/jcpgcie/rockauto_jeep_liberty.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/ja5hgeJ/music_themed_painted_rocks.pdfIn PDF document text
    • https://mozevosiku.weebly.com/uploads/1/3/3/9/133999333/9363540.pdfIn PDF document text
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/8549971.pdfIn PDF document text
    • https://nipoxumafoji.weebly.com/uploads/1/3/4/7/134717148/3562483.pdfIn PDF document text
    • https://cdn.sqhk.co/ketifoseja/d3ghahc/sonic_skins_for_minecraft_pe_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xeveweno/ig4ig8O/92044809288.pdfIn PDF document text
    • https://topazezinin.weebly.com/uploads/1/3/0/9/130969714/tuzat.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxonavi/igbmejf/63288224043.pdfIn PDF document text
    • https://penuwepilaxol.weebly.com/uploads/1/3/4/7/134756509/patalego_totetekuwuv_jezib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/financial_reporting_process_controls.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14493 5196 bytes
SHA-256: 166520dddacb042f7e06b325dbb88ff65fa1956469f4c2902a4b5b74b58b933c
font_01_sfnt_off0001563f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1563F 6492 bytes
SHA-256: a6044a19c4b3402f600a2baa592bcc46723f090c9929124b9a290f53aac590d4
font_02_sfnt_off00016795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16795 11352 bytes
SHA-256: dc4eaa5b79523ee9f185a9f06f79987ba60220c0d94657bd11a6eb3bf3462e2d