Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4c4cd830046919…

MALICIOUS

PDF

78.5 KB Created: 2021-03-28 17:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cf6e1ba0e9886bac8c29d061bedc76a SHA-1: 253abe4429895adc6e4a2c6e21054d331fb511c3 SHA-256: 1b4c4cd8300469190018d1545419f1914b9d94a4a3cb0ecffd75b5218a585de3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, suggesting an attempt to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and link farm heuristic point towards a malicious document designed to redirect users to potentially harmful websites.

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://ponafet.ru/award?keyword=anemia+por+falta+de+hierro+pdf
    • https://cdn-cms.f-static.net/uploads/4481676/normal_600f1fb90bf05.pdf
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/kowajomadapufememaro.pdf
    • https://kiwakamumosa.weebly.com/uploads/1/3/5/9/135963193/vimativexaseku.pdf
    • https://cdn-cms.f-static.net/uploads/4376878/normal_602ebd1d59d54.pdf
    • https://cdn-cms.f-static.net/uploads/4453129/normal_605df9ade581a.pdf
    • https://jabiratunibi.weebly.com/uploads/1/3/2/6/132683422/gajuviririkem.pdf
    • https://sidatenut.weebly.com/uploads/1/3/5/3/135349940/vevuwolusi_pizeba_vifidujugeda_gegekovo.pdf
    • https://cdn.sqhk.co/kisudosus/jhd30gh/skewerz_kebabz_townsville.pdf
    • https://cdn-cms.f-static.net/uploads/4379371/normal_600a29bc2b3e6.pdf
    • https://tozovugoji.weebly.com/uploads/1/3/1/6/131606343/e06b03.pdf
    • https://cdn.sqhk.co/litonesi/ijV5hjk/kuzinulazukegola.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_c0e59dc321614ad292d338835aa2ede4.pdf?index=true
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_3b6be94e606646feb621fe0f8330cb5f.pdf?index=true
    • http://kosidigipetuvu.epizy.com/oreck_air_purifier_truman_cell_cleaner.pdf
    • http://zetitovafe.rf.gd/barclays_online_test_answers.pdf
    • http://bubewap.rf.gd/brigandine_iso_psx.pdf
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_e43da46e316347a680faf3a0d5267d4f.pdf?index=true
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_f3b7930267954336a68076ab3f650ab1.pdf?index=true
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_d4da15ecb7644e3bb856d22f9715648b.pdf?index=true
    • http://nadiripu.epizy.com/puritan_bennett_840_ventilator_manual.pdf
    • http://sidigoxe.rf.gd/husqvarna_315x_bedienungsanleitung.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_off0000f45d.bin
d9f6070af3126bd73ce3c8e33c2f2e81542927afcd6dc3ccbd2c36cd83e7232c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 5092 bytes
font_01_sfnt_off0001057e.bin
d2e1a3484c1397aa761da76106d6165292e5ebcc44e81cd4f3df54aacd8181e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 11616 bytes

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