Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe83f02761170a1…

MALICIOUS

PDF

80.4 KB Created: 2020-12-16 01:18:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 16372c859cdeaf7bbef0859f93c87e52 SHA-1: 49acd3e375356218a5751febeedd16585d0e75b3 SHA-256: 4fe83f02761170a1f85097ee3a158e239e91a766d1b200c5572ccd23b26b4ffa
242 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a link farm. The presence of a download button lure and a callback lure further supports a phishing or scamming objective. Although no scripts were extracted, the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the ML_NYX_PDF_MALICIOUS flag strongly suggest this PDF is designed to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffmen.ru/strik?utm_term=where+to+buy+black+core+edge In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381095/normal_5fad9775674e6.pdfIn PDF document text
    • https://galezarulunozip.weebly.com/uploads/1/3/4/8/134896955/156811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379030/normal_5f8cbce4edde1.pdfIn PDF document text
    • https://vuketuwanez.weebly.com/uploads/1/3/4/5/134592446/a2a4d573346.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/018ed1d9-ec0f-4dbb-b667-92baab9d8abc/cool_reader_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/36848563749.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dc971c8c741314319700/t/5fc1acc91972c46e3cdd8813/1606528213278/pip_award_letter_sample.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc13c726609fd0ee793905a/t/5fc9e9bf2f5dbb44b77f4050/1607068096852/mlb_standings_espn_2016.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc29d2a403f5353fda0c22b/t/5fceb45006785e60cf012026/1607382096705/81032543944.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4038b1be-8cb3-4bfe-865e-1bda6fbcf674/1587407802.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ea93e90-0693-4ac9-a870-d3862d3de0f5/palezetaxuxodexerufi.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/wewewuzerir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ee7645-10e4-41f5-bef9-1071019f0546/81228912773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a39bc530-7025-4d2c-8cca-53c1176c4fcb/91792352157.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 5068 bytes
SHA-256: e6edd72bced486a272b3bd314d0b099e5ac90e52293f7aee837162414894a943
font_01_sfnt_off0001011a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011A 10992 bytes
SHA-256: c715ec7d55dcf6a7f927eec8dc8d10ccec715dfb48a3a47fbd5266294bead007
font_02_sfnt_off0001267e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333