Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d64ebbcdc79f7f…

MALICIOUS

PDF

77.5 KB Created: 2021-04-06 21:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ab15738846d14edf56cadba8ebeb5777 SHA-1: cba3489134771025497fadcf3d5d36d35dc4fed6 SHA-256: d3d64ebbcdc79f7f61d880cc2aa15b2fbe6fa2e2c82f113769262d7db2e144e3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://midufefew.ru/strik?utm_term=the+red+umbrella+by+christina+diaz+gonzalez+pdf PDF link annotation
    • https://fatibetoliwan.weebly.com/uploads/1/3/4/7/134731660/5294541.pdfIn PDF document text
    • https://numuwawi.weebly.com/uploads/1/3/2/3/132303164/vofijorimomix.pdfIn PDF document text
    • https://finedogu.weebly.com/uploads/1/3/4/7/134749629/6136965.pdfIn PDF document text
    • https://xazowivuxef.weebly.com/uploads/1/3/4/5/134513065/8218089.pdfIn PDF document text
    • https://loxoxonejuk.weebly.com/uploads/1/3/4/6/134684666/4537231.pdfIn PDF document text
    • https://juzowugaf.weebly.com/uploads/1/3/4/7/134773334/9ca62.pdfIn PDF document text
    • https://cdn.sqhk.co/xekawiba/jWyOrjf/23329949799.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/JmgjN33/itunes_cho_my_tnh.pdfIn PDF document text
    • https://cdn.sqhk.co/rizakumer/G7ihKHL/miro_humidifier_assembly.pdfIn PDF document text
    • https://cdn.sqhk.co/lamikolo/cjjabc5/unofficial_handbook_of_marvel_comics_creators.pdfIn PDF document text
    • https://vedefagam.weebly.com/uploads/1/3/0/8/130814874/jisuri-jozujowaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rimuvuvipimube.epizy.com/coil_winding_wire_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24299045-54ea-441d-92e0-042dc2aa101b/free_blank_frayer_model_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6a4cdad-0e43-4611-a45b-15dd47d45959/42375995431.pdfIn PDF document text
    • http://puwagof.rf.gd/ammonium_formate_sigma_70221.pdfIn PDF document text
    • http://zewogukanonudut.epizy.com/55005946401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbaa4fed-f9e0-4ff4-874a-1503f9bd2573/ejemplo_de_dialogo_en_ingles_de_dos_personas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d4fbc6c-dc2f-4f6a-bc0d-bb354d7ad7c6/libro_de_desarrollo_humano_de_diane_papalia_y_ruth_feldman.pdfIn PDF document text
    • http://lajixowamimexo.epizy.com/34014059969.pdfIn PDF document text
    • http://tuguwobafadurot.rf.gd/bulorutatopil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fed636b-9846-4d2f-84c9-fd589f618cfa/fisher_price_auto_rockn_play_canada.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_off0000edc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 5812 bytes
SHA-256: 19eb703ff812a6e4c5cc95f42884499db3ac091662cf4b4cebf845d09a8ef850
font_01_sfnt_off0001016a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016A 11584 bytes
SHA-256: 789acccda387c2c4c824f2ea1dba1dd6cd714d2bb80fefb0dd2d3e3d5072eba0