Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef34f508ec839b31…

MALICIOUS

PDF

77.1 KB Created: 2021-03-10 01:26:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 640a363f8a6afd50109d2c603c54841b SHA-1: 494e693f2d32a7aa97ab9e41f19f6ad6ed90f36d SHA-256: ef34f508ec839b31ba9976032c87f826df535689c4438af475aaeb131c9c1799
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM, indicating a high likelihood of malicious redirection or link farming. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were extracted, the embedded links are the primary indicators of malicious activity, likely serving as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/wix?keyword=iowa+star+conference+meskwaki
    • https://cdn.sqhk.co/vakenuda/jcxiaib/repenone.pdf
    • http://coins24h.com/what_does_a_raven_mean_in_vikings4sh7t.pdf
    • https://static.s123-cdn-static.com/uploads/4527902/normal_5fee3ce25e1d0.pdf
    • https://cdn.sqhk.co/bomemenun/3vYFggT/88254246020.pdf
    • https://cdn-cms.f-static.net/uploads/4488804/normal_60414df38b1fc.pdf
    • http://gladkoe-telo.xyz/47077924133xbizu.pdf
    • https://cdn-cms.f-static.net/uploads/4462344/normal_6031060300f7f.pdf
    • https://cdn.sqhk.co/panazomuv/hgiJXhc/download_my_chicken_2_virtual_pet_mod_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4408343/normal_603e179678c74.pdf
    • https://cdn-cms.f-static.net/uploads/4492246/normal_601bb6b3c21df.pdf
    • https://cdn.sqhk.co/gukitane/bhdjbW8/krita_vs_gimp_vs_paint._net.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/baposivarabuj/raretiperaxugafuvazemiri.pdf
    • https://s3.amazonaws.com/juduk/brochage_afficheur_7_segments_anode_commune.pdf
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_9a1572bd0eec440ba49821bcc067acb8.pdf?index=true
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_c26b1bdb5c9c4a4f925b20bade567760.pdf?index=true
    • https://s3.amazonaws.com/nitizobuv/emergency_contact_list_template_for_babysitter.pdf
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_f22a7831e09d4e88b62c106ac3941c44.pdf?index=true
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_6a75b481fbc84ba08b3ed740e8b7c160.pdf?index=true
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_41af7cf130d2487bb80ef2e688a2cfdc.pdf?index=true
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_0e173856dc92480a8a1f6289cec5847f.pdf?index=true
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_ef868504ffee4626b9e2db2190b85458.pdf?index=true
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_2fbebee365394d009b39910ef6b7f845.pdf?index=true
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_9e2bb46b9bb84a67be7817b88ad065e1.pdf?index=true
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_643996a2306148d7a27891c1ee38a7a8.pdf?index=true
    • https://s3.amazonaws.com/guvovigo/under_pressure_queen_sheet_music.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_off0000f250.bin
a4353f43e09f556a3bd4874950a9fd3ff985e1e279d9740d362d6c4fbfdb95e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 5088 bytes
font_01_sfnt_off000103a2.bin
9734d4429149f8e65b1e7723d3deb7d4dd50f751879f632c23a7224ee74d6326		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A2 10276 bytes

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