Malicious PDF — malware analysis report

Static analysis result for SHA-256 543aad7c1631bc91…

MALICIOUS

PDF

73.2 KB Created: 2021-03-16 12:56:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bb933454f44f1be820f01c5ddf08ace SHA-1: 7730a36e6070814491e85f61f816fe0a542be352 SHA-256: 543aad7c1631bc916b1c3ce32522517c98727f7dad426caafff66c35c71b87fc
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, flagged as a "PDF_SEO_LINK_FARM", and is detected as malicious by ClamAV and an ML classifier. The document body, though heavily obfuscated, suggests a lure related to "lsac gpa calculator", indicating a potential phishing or spamming operation. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious or spam content.

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-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://bologen.ru/wix?keyword=lsac+gpa+calculator
    • https://static.s123-cdn-static.com/uploads/4490752/normal_5fc881a625be7.pdf
    • https://kebokezuzak.weebly.com/uploads/1/3/5/3/135318209/mabuv.pdf
    • https://cdn.sqhk.co/vujenibolo/YgcyYgg/jupulemanufob.pdf
    • https://tijezelaxupoki.weebly.com/uploads/1/3/5/3/135340387/lutenulejepoli-nofowajesewura-garugujib.pdf
    • http://getliterate.online/todibowagijigofupl8jh6.pdf
    • https://cdn-cms.f-static.net/uploads/4460678/normal_603f0a7538e57.pdf
    • http://soldatskaya6.ru/dezototikevgknvm.pdf
    • https://cdn.sqhk.co/neliwuwo/gts0ijU/dirisugipuroxaxezubiw.pdf
    • https://cdn.sqhk.co/dijexovesaf/7d5hjfL/13157829503.pdf
    • https://static.s123-cdn-static.com/uploads/4454289/normal_5ff605fca39fd.pdf
    • http://copyright-supporthelp.com/pasixababelitifotukaruiay9z.pdf
    • https://cdn.sqhk.co/bobimugura/ayge5mj/sandvik_coromant_catalog.pdf
    • http://extraterrestrials.space/free_download_harry_potter_full_movi0uuqg.pdf
    • https://cdn-cms.f-static.net/uploads/4531523/normal_601dd0458c725.pdf
    • https://static.s123-cdn-static.com/uploads/4391314/normal_5ff199f8efe35.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_99c2a18afd264bcc8be5ae34d9a15644.pdf?index=true
    • https://673fcb93-492a-40d1-a7cc-77260b5c7816.filesusr.com/ugd/62d21a_35c314beb8d44a868a99a74d2580a7bd.pdf?index=true
    • https://7605c768-a471-4169-85a9-0dab509fd250.filesusr.com/ugd/20ab23_d87d4d256ef44905981ff694076d1f8b.pdf?index=true
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_904124fbce3545da83eec77427176a9a.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_off0000e3d4.bin
92227e37d6aa11078bc2fd5799abd10f4d037734065a48402998f26446a079d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 5040 bytes
font_01_sfnt_off0000f50e.bin
9069f7b467663a5cb43879e8a5d3f1b1916d9f9016d8a331814fcdf48ebc4d0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 10232 bytes

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