Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc64f237d802aa9c…

MALICIOUS

PDF

71.2 KB Created: 2021-03-31 05:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51115bbcb606d9f6c85a1e215ea66ee5 SHA-1: d5853ffd38ca6310dda83bfaaa036e4c96e36d66 SHA-256: bc64f237d802aa9c615a95ba2f379efc1a0b62d0faebfc85d2851d4c7852832a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely to a malicious website or for SEO manipulation. The embedded URLs point to various PDF files, some of which are confirmed benign, but others are unknown, suggesting a distribution mechanism for further malicious content. No scripts were extracted from this sample.

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://fokemale.ru/award?keyword=norme+afnor+x50+750+pdf
    • https://pixadodo.weebly.com/uploads/1/3/2/7/132740612/c008d.pdf
    • https://static.s123-cdn-static.com/uploads/4464303/normal_5fe50a9b7a442.pdf
    • https://foretenam.weebly.com/uploads/1/3/4/7/134700633/9610034.pdf
    • http://temevifeg.iblogger.org/marico_bangladesh_annual_report_2019.pdf
    • https://static.s123-cdn-static.com/uploads/4448548/normal_5fcf08b4d33fc.pdf
    • https://static.s123-cdn-static.com/uploads/4450147/normal_5fe55c4dd85b6.pdf
    • http://wizatone.iblogger.org/fmla_cert_forms.pdf
    • https://jovinafunen.weebly.com/uploads/1/3/2/6/132695325/9163695.pdf
    • https://gajegebukorivip.weebly.com/uploads/1/3/4/4/134487765/wemonusug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_e864d893984a4e3c9ed58af47d3d81db.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8968f969-0d3a-42bb-83fc-abc32873bd01/seranotejejedi.pdf
    • http://getuweloniwa.rf.gd/56096156109.pdf
    • http://vilolosukip.rf.gd/video_helper_pour_safari.pdf
    • https://c69a8150-bb1e-4c46-878b-fc1622391bd7.filesusr.com/ugd/cf91d6_b19da61c792f42b7b03e3d4d4dcfde64.pdf?index=true
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_68f222fe262949f299ad4095180bfec2.pdf?index=true
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_2dda74fe229a459789cf09eb096368db.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ce0a4838-0409-48d5-a195-d716db4ea2e2/what_is_daring_mean.pdf
    • http://wumaxodozitokaw.epizy.com/80563790417.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_off0000d51a.bin
21edbcdcf7af20e2eb912b3785df48606f9264687bf8e6a43a4001c1733e7fe5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD51A 5360 bytes
font_01_sfnt_off0000e755.bin
8f7e132b800d80a3ada35e3533a2e0a2c4cdc3f47a24bfd01cc392c536dad1bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 11836 bytes

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