Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4040f65a35b47b8…

MALICIOUS

PDF

74.2 KB Created: 2020-12-27 19:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 28635e7de4ca5d8a2c27d46792995f34 SHA-1: 1e04655f64fcfda8a9ee2f84d5c93313b2a60a61 SHA-256: f4040f65a35b47b8e1d8d350f246299277b9b0c3dbd0f51779c8f29eaf18d1da
252 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation scheme. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ggtraff.ru/123?utm_term=epiphone+ea+250+case In PDF document text
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/ead21.pdfIn PDF document text
    • https://cdn.sqhk.co/tusumawibe/qGvhgYS/download_game_puzzle_hero_pc.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/xomed_newozepudokuw_gokizivofija.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421624/normal_5fc6a1b79bc69.pdfIn PDF document text
    • https://juleverut.weebly.com/uploads/1/3/4/4/134488806/fupurupu.pdfIn PDF document text
    • https://tezolujekile.weebly.com/uploads/1/3/4/4/134497819/genadosakiwapa_birajedom_lakida.pdfIn PDF document text
    • https://cdn.sqhk.co/fofasafiwi/gmjgNif/free_homeschool_programs_in_va.pdfIn PDF document text
    • https://sowosevutab.weebly.com/uploads/1/3/4/3/134311467/nanigerevujedeselem.pdfIn PDF document text
    • https://wuriwodek.weebly.com/uploads/1/3/4/6/134688082/209375.pdfIn PDF document text
    • https://cdn.sqhk.co/fasixazijaz/jp1Qji1/kemogudurodojag.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/ge4zxhc/patukufawariwazibexil.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/fumiposamisur/fixed_cell_reference_google_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/54285873247.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_off0000e566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 5248 bytes
SHA-256: 6385e0c5c4ea4264c3fbddd45cc7096f81b7b0ca7b3d63cfaa78605a3716853e
font_01_sfnt_off0000f748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF748 10696 bytes
SHA-256: 98e7121fc7a172e43dcc04db4bc384d9735d6a66be9fd48f0a3b2ce5692d8196

Open this report in the interactive analyzer, or submit your own file for analysis.