Malicious PDF — malware analysis report

Static analysis result for SHA-256 1218403492b4e663…

MALICIOUS

PDF

82.7 KB Created: 2021-05-26 04:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e53e05890f137b7f8e42738b3746f0dc SHA-1: a33fe35a65ed8ddb9e9eaddc1ec83cec789f88f9 SHA-256: 1218403492b4e663160eab4a6cb8b866a55a1b5161c7bc96be370e35383398f1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. While many of these links point to benign content, the sheer volume and the presence of a critical ClamAV detection (Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0) indicate malicious intent. The document body, though heavily obfuscated, appears to be related to article writing, potentially serving as a lure. No scripts were extracted, but the PDF structure itself is leveraged for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cdn-cms.f-static.net/uploads/4451941/normal_60356a320eab0.pdf
    • https://cdn-cms.f-static.net/uploads/4447465/normal_60523b0259828.pdf
    • https://cdn-cms.f-static.net/uploads/4382187/normal_6044d6e9b8f14.pdf
    • https://lijepaxo.weebly.com/uploads/1/3/5/3/135324298/8761258.pdf
    • https://cdn-cms.f-static.net/uploads/4450504/normal_604f55aabacb5.pdf
    • https://cdn-cms.f-static.net/uploads/4459058/normal_6054feebdde8b.pdf
    • https://static.s123-cdn-static.com/uploads/4378390/normal_5fcd6de7b7327.pdf
    • https://cdn-cms.f-static.net/uploads/4447912/normal_6029cff07b766.pdf
    • https://leduxuma.weebly.com/uploads/1/3/2/8/132814900/8aa2cc323c.pdf
    • https://cdn-cms.f-static.net/uploads/4450898/normal_5fea36f3c3484.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://feedproxy.google.com/~r/wb/ENAH/~3/dN4lCoxrs6M/wb?keyword=how%20to%20write%20news%20article%20and%20feature%20news%20with%20its%20example
    • https://s3.amazonaws.com/saziwijaxodav/platicas_de_seguridad_en_mina.pdf
    • https://s3.amazonaws.com/turip/lycan_dotabuff_guide.pdf
    • https://s3.amazonaws.com/paxuvagal/how_to_change_battery_in_homedics_scale.pdf
    • https://s3.amazonaws.com/tonisefoteka/73967985839.pdf
    • https://s3.amazonaws.com/sifawekujiki/76654782268.pdf
    • https://s3.amazonaws.com/bakoloj/ligagaziwobexefesosudutuv.pdf
    • https://s3.amazonaws.com/sazomo/ccat_number_full_form.pdf
    • https://s3.amazonaws.com/towakog/call_of_duty_modern_warfare_2019_android.pdf
    • https://s3.amazonaws.com/ximupuv/2555418226.pdf
    • https://s3.amazonaws.com/zabejuvijolu/singer_handheld_sewing_machine_threading.pdf
    • https://s3.amazonaws.com/lowebemuwojiso/67211869335.pdf
    • https://s3.amazonaws.com/pewebopufupe/paxukuwifow.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6e7.bin
0d2bd0995529f3f041c2a6e7f9303f4d9a667633066aeac32ae4f2afde70b3f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 5396 bytes
font_01_sfnt_off00010923.bin
abede0d3419cf82dee7048f59e37fa220cbef1f2f1067fc19f5a9940261ee97f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 11080 bytes
font_02_sfnt_off00012ef7.bin
781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF7 4324 bytes

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