Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e538a2caaa2a12…

MALICIOUS

PDF

75.5 KB Created: 2021-03-01 18:59:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cc1698a95b4d2ac6605a4562522535ed SHA-1: 2c26ac36e1df32c7b208413d4a3766a9b934e73a SHA-256: 21e538a2caaa2a1211abe60c007503624b4e8cc78e7fdd72ff0d5ca9d1a062b7
206 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, forming a link farm. The document body is heavily obfuscated and appears to be junk data, but the presence of numerous external links suggests a phishing or SEO manipulation scheme. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/aws?utm_term=wd+tv+live+plus+hd PDF link annotation
    • https://datokusowijodo.weebly.com/uploads/1/3/0/7/130776434/da6ef329cd508.pdfIn PDF document text
    • https://voxonevixes.weebly.com/uploads/1/3/4/3/134383310/boniparurik_xufijejikoba_migorig_wotamakegiwajeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444371/normal_5fe2e6621ab72.pdfIn PDF document text
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/938840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382953/normal_6021a0c8c1aef.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/85YTdGD/96321729199.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/jzAUicE/tenosonegoduxokaxubiliza.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/icgcEWB/battery_charger_12v_24v.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/jNfEGhe/qr_scanner_iphone_not_working.pdfIn PDF document text
    • https://dojinutek.weebly.com/uploads/1/3/4/1/134108596/602248.pdfIn PDF document text
    • https://jokiwuruxuwam.weebly.com/uploads/1/3/1/4/131437523/keleganip.pdfIn PDF document text
    • https://vipavogezeguw.weebly.com/uploads/1/3/1/0/131069860/puvov_bovetez_vofuwebezad_zidudilufep.pdfIn PDF document text
    • https://cdn.sqhk.co/pinebiven/8nF2ggg/28362613970.pdfIn PDF document text
    • https://cdn.sqhk.co/pesegozod/Ahfeqgc/30109692005.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/DQohihc/espn_nfl_power_rankings.pdfIn PDF document text
    • https://cdn.sqhk.co/fufigavaki/jjgdvaX/dabebukamuf.pdfIn PDF document text
    • https://ruzuwigowan.weebly.com/uploads/1/3/1/4/131453288/zitiluvugulij-fesizel-xitamupeneg-rebuvez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ea42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA42 4816 bytes
SHA-256: cd9e37178a01ec0224d014082308399469c2a1452e00e44063d7ee4e6396351a
font_01_sfnt_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 11740 bytes
SHA-256: 1d8302d0d105e7e2321f3860fde8302fe925d5349206fbea86b56555b8552a1c

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