Malicious PDF — malware analysis report

Static analysis result for SHA-256 428e175a1c3dbcaf…

MALICIOUS

PDF

71.7 KB Created: 2021-03-14 12:52:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: dc51be892faef625fe9af91631d25643 SHA-1: afd867eb731d91c04cc0f0e70f91c17273816954 SHA-256: 428e175a1c3dbcaf1084890ab4a1702613ba0525f0da232a2db454ffa4029868
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including suspicious links and ML classification. One high-severity heuristic specifically flags an invisible link to a suspicious domain, suggesting a phishing or malware delivery attempt. The presence of external URIs and the overall structure point towards a document designed to trick users into navigating to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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.
  • 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://ponafet.ru/award?keyword=show+your+work+austin+kleon+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386607/normal_5fe4eeca004fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481275/normal_5fe8f639d2384.pdfIn PDF document text
    • http://muvepifare.mygamesonline.org/secrets_of_the_temple_slot.pdfIn PDF document text
    • http://fbcopyright-center.com/siveborexibaferuwuwomijar6v65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406208/normal_602a95c8aa81d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413978/normal_6008fb9320125.pdfIn PDF document text
    • http://peuer.xyz/waleniketevekatuxuzatuewipx.pdfIn PDF document text
    • http://lnstagram-support.live/52369509969xt8cd.pdfIn PDF document text
    • http://24goodstore.site/husqvarna_yth24v48_oil_filter_cross_reference_charte0zh2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389095/normal_5feee6aa679a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476768/normal_5ff3e6ba8c4a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426812/normal_604359098de44.pdfIn PDF document text
    • http://segaruzobuguses.scienceontheweb.net/17480054531.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382629/normal_5fca6dba845e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wusumuforibit.epizy.com/2443645030.pdfIn PDF document text
    • http://lofukikusi.epizy.com/38488993596.pdfIn PDF document text
    • http://moliposapivar.epizy.com/bonnie_and_clyde_1967_parents_guide.pdfIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_bfd03acbace84f27884c3856ada7365c.pdf?index=trueIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_16390448d3d040338d610e0737a61105.pdf?index=trueIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_8dba71bea3a446729131c2fca55976eb.pdf?index=trueIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_8bcf7487da544b3cb15b18021dbe0917.pdf?index=trueIn 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_off0000da8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 5488 bytes
SHA-256: 9ce1165e519eddfa3afec83af28d1dae0613cbf3e2477d7276dfa094efabe27a
font_01_sfnt_off0000ed49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 10868 bytes
SHA-256: f5912f57d0b389b743aa153981b57570ff3c24f47867c6c9af472df65c048e48