Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfed03e3c56255c5…

MALICIOUS

PDF

74.0 KB Created: 2021-04-07 17:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 33c3ce5540eb03a3e571f543928f6510 SHA-1: 4af90c121f27a91ac990dff02f314002dbbcd1e0 SHA-256: cfed03e3c56255c587ce04c2b2e67d9ae264fc46ce371fe503288b2d18469550
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to book creation, which is likely a lure to disguise the malicious intent of the embedded URLs. The ML classifier and ClamAV detection strongly indicate maliciousness, pointing towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dafemum.ru/strik?utm_term=how+to+make+your+own+book+with+paper In PDF document text
    • http://negozio50sconto.info/500766516511odyf.pdfIn PDF document text
    • http://cocobuka3.xyz/what_is_the_major_difference_between_arteriosclerosis_and_atherosclerosis6qr8z.pdfIn PDF document text
    • http://shopeuro.pro/relentless_from_good_to_great_to_unstoppablevf2m9.pdfIn PDF document text
    • http://study-english-05.site/25399779808zsjl8.pdfIn PDF document text
    • https://raxabebawozovi.weebly.com/uploads/1/3/4/3/134311701/wuzon-delukimasor.pdfIn PDF document text
    • http://easylearning.space/english_grammar_worksheets_for_classxrr11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446259/normal_5fc656c0cc74e.pdfIn PDF document text
    • https://dunabosugetagek.weebly.com/uploads/1/3/4/6/134601841/kamisagagebepu_gularunemop.pdfIn PDF document text
    • http://osmosiotzs.fun/is_black_and_decker_going_out_of_businessecbuy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417998/normal_601813db13c11.pdfIn PDF document text
    • http://totalcreditreport.info/pesozonowirugidolizpfyr.pdfIn PDF document text
    • https://xezamojukugenu.weebly.com/uploads/1/3/5/3/135316948/govojakesegi_zuvawadi_xatonuvo_vetijupum.pdfIn PDF document text
    • http://center-about.com/dufaxulw0m3.pdfIn PDF document text
    • http://mugedly.xyz/pitanisuz40oqm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ffdae3d9-3348-4763-bdfb-c99be72a9557/25531466409.pdfIn PDF document text
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_0bb01b3f161549698d149b826baa9df0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bb6b6da-a0c1-4d93-ae67-b97c0ee9779b/giwola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40295658-ce53-40c0-9e04-798d08907a49/42646809710.pdfIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_f6f8c070eee844248a5375d4ecf5bf5b.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 5092 bytes
SHA-256: 24b67bba6cf095b90ead392198e5fb7e16302edd5c16c67d84170882b2f2861b
font_01_sfnt_off0000ea62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA62 9996 bytes
SHA-256: 8fa1850c3c3367927bc2121bd42828f7c95f96340c948cb3ee91c37f1786a9fb
font_02_sfnt_off00010cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAB 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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