Malicious PDF — malware analysis report

Static analysis result for SHA-256 270f9e12f3956ea4…

MALICIOUS

PDF

80.0 KB Created: 2021-03-11 19:01:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: dc78aa9f1ed0c40fd013cd0e5e03ef55 SHA-1: 1c307c496cb58283271e00659f6998fde8579d83 SHA-256: 270f9e12f3956ea4a092a4caf651e339cf0a0451d2354ff8a618fc05955657db
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://gimoguvi.ru/award?keyword=aadhar+card+update+form+online+pdf PDF link annotation
    • http://myyshooop224.site/century_battery_charger_manual_87151nlfut.pdfIn PDF document text
    • http://shimano-stradic.ru/godkar_pathology_bookq1aam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470399/normal_5fd2859727b44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388174/normal_5ff853dd40ed0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480598/normal_603d910fe9908.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484993/normal_5ff3ce41610ec.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/55912856160vo1lk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383795/normal_603aa3cf9e341.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/susonanezaj/85997524816.pdfIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_ba36d79be7c34a57b891e62817ba4605.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokudapele/kizuwut.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/bellerive_oval_pitch_report.pdfIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_242b0373eec147cba1f78b270269abb9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/gre_quantitative_reasoning_sample_test.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/29577535758.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53D 5088 bytes
SHA-256: 9163863d76cd25adf7c4dc6967465bd4333eebcf4158ea53f12671e584fc80a9
font_01_sfnt_off0000f655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000fee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE3 11056 bytes
SHA-256: 8958c388a444c41c450772a523f5a995d4a15f459db6d3d2af23e0b2c26f6442
font_03_sfnt_off0001247f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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