Malicious PDF — malware analysis report

Static analysis result for SHA-256 f532f77ed4685f05…

MALICIOUS

PDF

79.7 KB Created: 2021-05-07 09:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b9b345068e9a9792f9a6be556d719bf SHA-1: dc76e56d61314d0d7bbbe3cdea6719b37df533aa SHA-256: f532f77ed4685f053a9ec62b5b9f9990355a63c02f607f9e854393cd019b8c55
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of an external URI in a malicious PDF suggests an attempt to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://jumiwimov.ru/strik?utm_term=carbs+in+burger+king+grilled+chicken+sandwich
    • https://cdn-cms.f-static.net/uploads/4404297/normal_60184d558ab99.pdf
    • https://cdn-cms.f-static.net/uploads/4377663/normal_6057da6b38e05.pdf
    • https://cdn-cms.f-static.net/uploads/4481699/normal_60243ca2966dd.pdf
    • http://dexiwakuxabef.medianewsonline.com/cambridge_advanced_learner_s_dictionary_2nd_edition.pdf
    • https://static.s123-cdn-static.com/uploads/4366340/normal_5fc693e396b6a.pdf
    • https://cdn-cms.f-static.net/uploads/4459478/normal_606067f4a8254.pdf
    • http://godezigupo.mywebcommunity.org/wanizegabipaw.pdf
    • http://bisapusid.mypressonline.com/washington_state_football_game_on_tv.pdf
    • http://tanubujurutemut.scienceontheweb.net/29952585021.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/468941aa-d221-4ac5-8fbf-d962a5c55cee/32704036595.pdf
    • http://jimomurapujivo.onlinewebshop.net/difinonuxowixugefeki.pdf
    • https://s3.amazonaws.com/nuxulikiwab/38418256682.pdf
    • https://uploads.strikinglycdn.com/files/5e2635fd-1dd4-4d04-a507-efe53e77279f/acceleration_calculation_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/53dc8c73-3ee0-4859-81d8-856ea13ea37f/attack_on_titan_2_gameplay_android.pdf
    • https://uploads.strikinglycdn.com/files/0e21f468-3aa9-4067-81d6-b74a0d8b559f/apa_itu_sepsis.pdf
    • https://uploads.strikinglycdn.com/files/8725bbce-bb67-4745-9867-256f37d9505f/satizi.pdf
    • http://kakasis.onlinewebshop.net/dasoxopusonagovij.pdf
    • https://uploads.strikinglycdn.com/files/ad39512a-87f4-46e7-b601-ca64238b2ee4/nipug.pdf
    • https://s3.amazonaws.com/novipaliwid/formal_definition_of_commendable.pdf
    • https://uploads.strikinglycdn.com/files/4d1b81e3-9cf8-4eea-a3fc-93b21894499b/zinemerapisijetifiwetet.pdf
    • https://s3.amazonaws.com/zamemigojat/weight_training_guide_app.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_off0000f843.bin
46b444b6fc248f56c96041d84d32c67be4c18ee85aa72e556a4466b985750200		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 5404 bytes
font_01_sfnt_off00010aab.bin
1febb423678ce3fa37b09c75df1d63e9c16ea35a8936a0997381632d998ff9e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAB 11400 bytes

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