Malicious PDF — malware analysis report

Static analysis result for SHA-256 694671de971ce60d…

MALICIOUS

PDF

72.4 KB Created: 2021-03-27 22:20:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 815b8daa68b960a782fa8866d4b519ce SHA-1: dd3f7fdc3813ad1b23082cd1200480aee93fdd49 SHA-256: 694671de971ce60dce46f0e69642db605a5d51e0af37065101fe2aa866ec2769
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a tactic to generate traffic or distribute malicious content. The presence of embedded URLs further supports the attack pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/award?keyword=wave+erosion+and+deposition+pdf
    • http://fibipowokogo.sportsontheweb.net/air_pollution_in_china.pdf
    • https://duvozogol.weebly.com/uploads/1/3/5/3/135314926/pimerewukizuka.pdf
    • https://bivupexas.weebly.com/uploads/1/3/1/4/131453521/6487226.pdf
    • https://dilafunur.weebly.com/uploads/1/3/4/6/134697396/0a0896fd44f3.pdf
    • https://tigerabedudutid.weebly.com/uploads/1/3/5/3/135304069/1e812d63b81647.pdf
    • http://bisituz.sportsontheweb.net/ridovetedu.pdf
    • http://tulutita.sportsontheweb.net/angels_in_america_kushner.pdf
    • http://ferategaj.scienceontheweb.net/water_pollution_project_for_college_in_bengali_language.pdf
    • http://vexoxem.scienceontheweb.net/mabagera.pdf
    • https://retibome.weebly.com/uploads/1/3/4/6/134680472/4281681.pdf
    • https://datedafobegab.weebly.com/uploads/1/3/5/9/135990096/perafaz.pdf
    • https://galanutix.weebly.com/uploads/1/3/4/5/134591813/6767284.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_5494d3db8404413fbaa690f399637226.pdf?index=true
    • https://uploads.strikinglycdn.com/files/70085f47-1770-44aa-8198-c993b104188f/cunto_es_una_pulgada_en_centmetros.pdf
    • https://uploads.strikinglycdn.com/files/83e52dce-4ac8-4e03-9bed-b8e7fe884411/fajejatetaderuneta.pdf
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_504c871b7c1d47a0b2148ec63e487023.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6dd04566-3595-47e2-a317-86356621a794/my_ego-t_battery_charger.pdf
    • https://uploads.strikinglycdn.com/files/685b7e94-cb57-4eb1-beec-02d573464997/bavitokelunelez.pdf
    • https://s3.amazonaws.com/gedimuta/bubusofokudakalotatox.pdf
    • https://s3.amazonaws.com/wujixus/40971297953.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1bf.bin
f2cdb8cc33c16c700da16ae11c13e4c9d30883ba921c2e5142fb504fc4b9bc1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BF 5076 bytes
font_01_sfnt_off0000f323.bin
85c71630de2a58280e9ae849869f0f8b7b7ace96a04cfcc41c179dd338665f37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 9884 bytes

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