Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e3a1c5755e83222…

MALICIOUS

PDF

73.3 KB Created: 2021-03-24 10:56:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fb2081e270229617788729e3106b87a SHA-1: a20dbcd025ef7d426fdcdb6341c712a45a72df6d SHA-256: 2e3a1c5755e832228a64ba273fc726aaa16793d33012a6dc66088aad50c18df3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious domains, indicating a link farm or phishing attempt. ClamAV and ML heuristics confirm its malicious nature, specifically flagging it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/strik?utm_term=jersey+mike%2527s+subs+%25237+turkey+breast+%2526+provolone+sub+wheat+giant
    • https://lilikegemuvil.weebly.com/uploads/1/3/1/3/131398424/dorapupufudaj.pdf
    • http://bezerojiw.scienceontheweb.net/pozimotujuxaja.pdf
    • http://xawegap.mywebcommunity.org/how_to_wipe_a_samsung_galaxy_tab_4.pdf
    • http://filozajerezabi.getenjoyment.net/benicar_anlo_bula.pdf
    • https://dedemapisiwopiv.weebly.com/uploads/1/3/0/7/130775251/3666331.pdf
    • http://nokiwurugibub.mypressonline.com/beneficial_owner_form.pdf
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/wojuvopimumosuvopo.pdf
    • https://nisivijuwowog.weebly.com/uploads/1/3/0/8/130813757/bifasafuxe-rilevifej.pdf
    • http://gixapedotamerow.mywebcommunity.org/microsoft_office_365_quick_reference_guide.pdf
    • http://gagefiwirimat.medianewsonline.com/relative_bioavailability.pdf
    • https://moredotaze.weebly.com/uploads/1/3/0/7/130776260/cd9ddb.pdf
    • http://serururepus.scienceontheweb.net/85426016251.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vavapekadoliti/can_silent_hunter_3_be_played_on_windows_10.pdf
    • https://s3.amazonaws.com/jolituzoji/longest_paper_ever.pdf
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_69417e1d70e14d608e7312f7c2482149.pdf?index=true
    • https://s3.amazonaws.com/zerepuzuze/gaxivubabaso.pdf
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_3f75385102504590bd020fecfd53cda1.pdf?index=true
    • https://535f918c-e50e-4760-9dbe-4b22a9cc1357.filesusr.com/ugd/65883d_d4d1183375b64d978c22f124d4f23de4.pdf?index=true
    • https://s3.amazonaws.com/kudowo/paint_brush_font_style_free.pdf
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_31bed8f4dd2548c9a986e1f097f1f899.pdf?index=true
    • https://s3.amazonaws.com/zuponefi/boxing_game_apps_for_android.pdf
    • https://s3.amazonaws.com/tometubufimopim/rerixewotowi.pdf
    • https://s3.amazonaws.com/solonebosop/mrityunjay_kadambari_in_marathi.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_off0000d282.bin
53dacb3e6f07caa9ef862aa228ca49293d032a5fab93507c2af0cb3b1e1ec0cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD282 4504 bytes
font_01_sfnt_off0000e1ce.bin
24dfa53064300b024ca812c0f48672837fb3f9a2be29722bb4e32d11e321e1f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CE 11584 bytes
font_02_sfnt_off00010853.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10853 4324 bytes

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