Malicious PDF — malware analysis report

Static analysis result for SHA-256 510cba12363902aa…

MALICIOUS

PDF

74.1 KB Created: 2021-01-11 20:54:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9cf646bee1f5ba919c1292f138dc8771 SHA-1: 18acc9eb09f8e46d12585b7a6da26a489e2a4533 SHA-256: 510cba12363902aa489668d845d81b48a910a3d7c6aaacd8153cc5d62d9c0325
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics. It contains a mass of external links, many hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of a malformed exploit stream and the callback phishing lure heuristic further support the malicious intent, likely to trick users into clicking links or calling fraudulent numbers.

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
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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) 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://traffnew.ru/wb?keyword=bein%20sports%20directv PDF link annotation
    • https://xemamipu.weebly.com/uploads/1/3/0/8/130813095/ffbe4c58b1b30e.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/20b57de6c3525e.pdfIn PDF document text
    • https://wosiwimobej.weebly.com/uploads/1/3/1/1/131164223/zudamef_pumasiv_lipeke_wilirekim.pdfIn PDF document text
    • https://lusogovo.weebly.com/uploads/1/3/4/3/134358567/gaditanopatinet.pdfIn PDF document text
    • https://fasepilof.weebly.com/uploads/1/3/1/1/131163931/xubafubuvolig.pdfIn PDF document text
    • https://nabisipiguges.weebly.com/uploads/1/3/4/4/134432296/4937290.pdfIn PDF document text
    • https://site-1168513.mozfiles.com/files/1168513/tofitufasofojadonajibam.pdfIn PDF document text
    • https://dusuwepi.weebly.com/uploads/1/3/4/5/134589125/971913.pdfIn PDF document text
    • https://site-1174999.mozfiles.com/files/1174999/demevozumuvike.pdfIn PDF document text
    • https://site-1176001.mozfiles.com/files/1176001/25801765831.pdfIn PDF document text
    • https://tixaradizu.weebly.com/uploads/1/3/4/6/134652762/418e83386d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5fc2d5a24c777.pdfIn PDF document text
    • https://nopifabuda.weebly.com/uploads/1/3/4/6/134693299/pepekuzuribad_liduzezubu_dodigotas.pdfIn PDF document text
    • https://rugezanuw.weebly.com/uploads/1/3/1/4/131483337/xexatalogetutukuxune.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/brabantia_bin_liners_size_guide.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_off0000e464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE464 4936 bytes
SHA-256: 167201b7b97ce20b4d85cc2b40f10716ed6de587721f6575bda880703d28b169
font_01_sfnt_off0000f547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF547 11412 bytes
SHA-256: 18b61fba402db6645c948f7e9c98021a37cdb35a5c22d434beb12a8dbc5e4606