Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4487c134fd4b38…

MALICIOUS

PDF

79.2 KB Created: 2021-03-17 06:34:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 343b23eae47b44b260ec1f950e23a0b7 SHA-1: ae6d309b096b8b31406d90456fb376a6b626974d SHA-256: bd4487c134fd4b383fe129ea3acc5ac3d9796141e88b0f4a21a423811a1d500a
96 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous embedded URLs, one of which is flagged as malicious. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to product reviews, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://vilenefex.ru/strik?utm_term=omega+nutrition+centre+masticating+juicer+reviews
    • https://cdn-cms.f-static.net/uploads/4490953/normal_60494565ad6ae.pdf
    • https://cdn-cms.f-static.net/uploads/4487424/normal_5fd15edca99c0.pdf
    • https://static.s123-cdn-static.com/uploads/4387430/normal_5ff65b306b24a.pdf
    • https://cdn.sqhk.co/zuzudumijamo/jh39Sb2/momexax.pdf
    • https://cdn.sqhk.co/nomevagume/ghghi1C/4k_video_player_apk_free_download.pdf
    • http://gemofesane.medianewsonline.com/josumexafitisasesum.pdf
    • https://cdn.sqhk.co/fazologim/gcg0hae/nesolepuxitaretuxi.pdf
    • https://cdn-cms.f-static.net/uploads/4416154/normal_603a94d76e9cd.pdf
    • http://vumonivaxozutod.mypressonline.com/47577293543.pdf
    • https://rijijuxika.weebly.com/uploads/1/3/5/3/135346754/c98d3510b.pdf
    • https://static.s123-cdn-static.com/uploads/4465539/normal_6009928cc11a5.pdf
    • https://wefigofotagovir.weebly.com/uploads/1/3/4/8/134864379/bobugujuvivuk-delobapatim.pdf
    • https://cdn.sqhk.co/vagewovupug/ibhevjf/guns_for_minecraft_1._16.pdf
    • https://tedawubav.weebly.com/uploads/1/3/4/3/134376018/gapebogujot.pdf
    • https://cdn-cms.f-static.net/uploads/4415526/normal_602ec1aabd6ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_c7d79b89d7414921b40a0db722830be4.pdf?index=true
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_2595985ddcff42b2aabfad26bed19713.pdf?index=true
    • https://05b56818-8b0b-4484-a411-4f1234233f1c.filesusr.com/ugd/e49726_c1c3ce3d75904a9fb0c5a53410d6019d.pdf?index=true
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_313a041accbf4941a9ed64a32c4b0b7f.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_off0000f64b.bin
0cebaa64c546dd9387bb9e0027c8c7386518cbbec55606c1e4945ef4a0155422
pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 5340 bytes
font_01_sfnt_off00010876.bin
31a9c1661023a5ab775604f5cc2d1925278576dd267c702ff13178d58ea2e658
pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 10724 bytes