Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9edac11527b9108…

MALICIOUS

PDF

75.3 KB Created: 2021-03-10 21:25:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1af13519460b553b61b5e0c4edc57533 SHA-1: ee300687f2cb8ed9af65a59db8d43c4c56109203 SHA-256: f9edac11527b9108da30ecf3d6418ec5de2c2e1c1d7a9937b203d2343b6da64e
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, with heuristics indicating it contains a large number of external links, suggesting a link farm or SEO scam. The embedded URLs, such as https://pelibifir.ru/award?keyword=arithmetic+series+word+problems+with+solutions+pdf, are likely used to direct users to malicious or deceptive content. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links point towards a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/award?keyword=arithmetic+series+word+problems+with+solutions+pdf
    • http://bumasujofoj.getenjoyment.net/61831569904.pdf
    • http://avit0.cc/48526910061w3p4b.pdf
    • http://momentshop.space/analytic_geometry_and_calculus_3pvjn4.pdf
    • http://padojobimo.mywebcommunity.org/39386024598.pdf
    • http://zoomita.space/9883610064940rbw.pdf
    • http://kafalukuwemi.mygamesonline.org/fabigudafipabesorifoginom.pdf
    • http://vowujebotoza.mywebcommunity.org/5316004198.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1409428a-c63e-4e0f-8991-c6f3f74feef3/what_is_conversational.pdf
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_d5d6b4641c194cb383beeefca2e18159.pdf?index=true
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_bf2899c643c9403b92968d99ceee8460.pdf?index=true
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_aa009e0614df41b8b1dac595e8cdf789.pdf?index=true
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_072facbd923047ca9a0db900fe66df9f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/00a95410-608d-4ffb-ad79-a97e59eaab70/sezoro.pdf
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_b5e8c8fb92de46bebf9a7ab7f729a8d9.pdf?index=true
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_1d798a1c3ef24f1bbd4cee84b68e7f09.pdf?index=true
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_39fb78fee49240fd8114be964928f10b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d1f2da01-fa60-4727-874f-eb4b7edac03b/vilisuzolirovopekix.pdf
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_0d5378b32afb41809924ce577c88c8ef.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6168fe54-ab5b-48b0-8876-fee811c3a6ea/whale_talk_movie.pdf
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_4b48b8aef04b4b73826fc348b228e4b3.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_off0000e6ce.bin
f14790f97da07711b301656696afd9a58bb1acd750e446b0889521b006993c17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CE 5404 bytes
font_01_sfnt_off0000f916.bin
46e9c8d0eb1e6de716ffe136b46ed828faaaf6dc999119916b19f791550adc66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF916 11520 bytes

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