Malicious PDF — malware analysis report

Static analysis result for SHA-256 c825ac12fa0ab59b…

MALICIOUS

PDF

87.8 KB Created: 2021-03-15 20:12:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 534cd95add0381ad8668537828c02d69 SHA-1: ae94bed6d041d31984f9114d6771e7ed2ecf2871 SHA-256: c825ac12fa0ab59b002c44e4f51035ebf32da86ce1711fd675f2e9c7b4b0d12a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning and directing users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' and the presence of many unknown-reputation URLs strongly suggest this is a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely leading to a second-stage download or credential harvesting.

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://crophysi.ru/wix?keyword=burn+your+portfolio+pdf+free
    • http://poradoit1.site/free_online_business_flyer_templateswfwab.pdf
    • https://vurerabekude.weebly.com/uploads/1/3/4/4/134493837/bunoviviset-suvozedeg-jetitedurub.pdf
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/zukifatuvojatoji.pdf
    • http://noncomform.space/pogenumevojofupabimaaxe45.pdf
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/163fd4d533.pdf
    • http://instasurprise.online/53291925005mtkx6.pdf
    • http://sacredname.ru/42077579169rw8x7.pdf
    • http://trelon.fun/girl_by_jamaica_kincaid_worksheet_answersjnxci.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b79f5e3c-e54d-4594-a56d-3058483b031c/31700961380.pdf
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_7557038759494d998f1a8421bca4ee86.pdf?index=true
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_c9f3e12b4d5740da95b5c5194ced3457.pdf?index=true
    • https://uploads.strikinglycdn.com/files/86748206-7f13-426c-a4a9-b147351269ec/lds_new_testament_student_manual.pdf
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_6caef666cdec4941894bbf644b838a3c.pdf?index=true
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_c2e9f999efaf4e8d907dc3c9c56696ff.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4992c5ce-f043-41eb-8aea-0a743dc54cd2/60814154296.pdf
    • https://uploads.strikinglycdn.com/files/41b7e344-cd89-418e-8ae8-19676312503d/15573848095.pdf
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_909db0b525354ae194d9c235c360e0d0.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001114a.bin
5e6f9c6d43f42b76c39730c6a3563ebf8423f33b4f025b0aa3a6900fbc8896ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1114A 4800 bytes
font_01_sfnt_off000121b2.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121B2 1800 bytes
font_02_sfnt_off00012a3f.bin
c71a83caa4277738fd5f7da1e5439902a575635cf751ab785f954162bf201063		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3F 11156 bytes

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