Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1500e94eb33523…

MALICIOUS

PDF

79.1 KB Created: 2021-03-18 21:12:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07be0ed25ea73b753ded37cbae10e0b1 SHA-1: d924be50aaf1f64bbd82cc5c9ab6685ac49abb3b SHA-256: 1c1500e94eb3352304220282fc1af14bbc8ffab95946af7a44de41f283ad99eb
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, with heuristics indicating it is part of a PDF link farm. It contains numerous embedded URLs, with the primary ones pointing to potentially malicious domains. The PDF structure and embedded content suggest an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://botokaw.ru/wix?keyword=4r70w+reverse+manual+valve+body
    • http://itfamily.info/199760017693pkv1.pdf
    • https://tujilebofali.weebly.com/uploads/1/3/5/3/135398949/91adc2a8adb0e.pdf
    • https://wurewoji.weebly.com/uploads/1/3/1/4/131438788/3326841.pdf
    • https://static.s123-cdn-static.com/uploads/4410714/normal_5ff0b00193695.pdf
    • https://static.s123-cdn-static.com/uploads/4392441/normal_5ff52b09c3024.pdf
    • http://pomirkapa.site/inspiron_3847_graphics_cardl9s55.pdf
    • https://cdn.sqhk.co/gegenosuzun/bjhJgcp/paxefapevijalalifawuw.pdf
    • https://cdn.sqhk.co/seponidozit/idhbjjQ/til_chikki_in_english.pdf
    • https://cdn.sqhk.co/difixoruze/Nx3Fajf/drums_parts_washer.pdf
    • https://gunapozebufe.weebly.com/uploads/1/3/4/3/134316646/roligurevopo-wixuzadanoj-pawijawimoko-lizuwu.pdf
    • https://mipikarekegimo.weebly.com/uploads/1/3/1/6/131606279/juzaduwikade_kigusipevetaju_dukevife_figanulato.pdf
    • https://cdn-cms.f-static.net/uploads/4421036/normal_603e6c2e5c210.pdf
    • https://cdn-cms.f-static.net/uploads/4419415/normal_5fdb52404a912.pdf
    • https://cdn.sqhk.co/xamubana/04szAmU/herpes_simplex_1_on_genitals.pdf
    • http://faceskinagainbeauty.xyz/zapegajufididakavukit2k6z.pdf
    • https://cdn.sqhk.co/tuzojivemepe/ugiWHml/2904071470.pdf
    • https://cdn-cms.f-static.net/uploads/4470035/normal_6025a4cdabf5f.pdf
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/gajoxejamugusu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_5da580e41f8f4fbdb286a8b402386edf.pdf?index=true
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_69d85644dd1841d0ba60e5974e8b963c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0c400740-b6c0-441e-b97e-5b8edb499bf8/42549377374.pdf
    • https://uploads.strikinglycdn.com/files/f77f6c5e-dc58-4ee9-bb68-415d9a2c9300/43752122586.pdf
    • https://14579757-8399-40ae-9aa0-1c510f02119b.filesusr.com/ugd/5613ee_c487ac1494fd4711ac02547b4cd0f32b.pdf?index=true
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_6cb276db5787478a8e2f4a19a81c0086.pdf?index=true
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_01ac6121fe4146a5b18645727218bac7.pdf?index=true
    • 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_off0000f639.bin
8a147fade59e041124e06e14a71a706e515ecfea82883c6fa714f34fd8dc59d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 5580 bytes
font_01_sfnt_off00010931.bin
caf6e74dcb15550237662c45c343d9506e58838e7b937b1b6ef2ac1d3c9895e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10931 10976 bytes

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