Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b29913e5a421f94…

MALICIOUS

PDF

78.8 KB Created: 2021-03-05 06:16:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 80af03cc556ac77f7b01663fb1db51e7 SHA-1: 784c104913a0e7a1e28268f25ce4c1c8060c848c SHA-256: 2b29913e5a421f94291bb509aade70b94e0d5604d6f3e2089d32957265d0e7e4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of seemingly legitimate or irrelevant ones. The primary malicious URL identified is 'https://xajibur.ru/123?utm_term=how+to+use+a+cuisinart+waffle+maker', which is likely intended to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • 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://xajibur.ru/123?utm_term=how+to+use+a+cuisinart+waffle+maker PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415304/normal_5fc9aaa449b2f.pdfIn PDF document text
    • http://smartycredit.info/human_body_system_questions_answer_keyjwrn3.pdfIn PDF document text
    • http://nafuvexozoli.iblogger.org/atlas_air_compressor_manual.pdfIn PDF document text
    • https://vomalutexoj.weebly.com/uploads/1/3/1/8/131871655/vadejujavibef.pdfIn PDF document text
    • http://lienforkid.com/tata_sky_packs_2019_list68kve.pdfIn PDF document text
    • http://gnatural.space/485452789807w9tl.pdfIn PDF document text
    • https://sasofisapen.weebly.com/uploads/1/3/4/5/134590640/wanasu-mibavose-lixut-viwipa.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/line_graph_in_excel_2016tpcjz.pdfIn PDF document text
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/172105.pdfIn PDF document text
    • http://strgb2.ru/51304737643bqest.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495391/normal_600cab8a5fdec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380528/normal_5fc92db6ed722.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490547/normal_5fe08dce71218.pdfIn PDF document text
    • https://dirotigakavomak.weebly.com/uploads/1/3/4/2/134235834/6971757.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c070801-7fdf-4ec5-abc5-c1ff4921e365/what_are_the_steps_of_a_heros_journey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/748a177e-addd-4ab4-bc9d-eac001acab64/natuvukevopigafulawa.pdfIn PDF document text
    • http://rapuzivawa.epizy.com/sumunuvoxuboluwijilitoso.pdfIn PDF document text
    • http://xuxegukazo.rf.gd/77069927065.pdfIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_8c3fdb6b9528465e8d0fbcbb80b0008e.pdf?index=trueIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_0a194b45142848f5bb0310ced1ff7513.pdf?index=trueIn PDF document text
    • http://jagixav.rf.gd/gimodanenipuvixibot.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_5d7ce99cdc004794a1ece392990366e0.pdf?index=trueIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_831d127481c64702b20175c27c532c21.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 5144 bytes
SHA-256: 715895a77196249937c1c5578099fd10c1a835bbc681709eea80f87840f51593
font_01_sfnt_off0001060e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 11268 bytes
SHA-256: 0e5003446d321aed9dfd70266182ac5bf271880c0325146e39b29c8e163c3b86

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