Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c54f1701c176c2…

MALICIOUS

PDF

78.5 KB Created: 2021-04-04 06:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 27ce6484ede22f247acb541013d21587 SHA-1: 246b5b8af0801cfc878604f62e88e760e6d44ad2 SHA-256: 49c54f1701c176c23b478ee9fc620f122d512402b7440573d404827df50f6a86
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. One prominent URL, 'https://midufefew.ru/strik?utm_term=spiral+dynamics+integral+theory', appears to be a primary lure. The malformed stream length heuristic also suggests an attempt to exploit vulnerabilities within the PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://midufefew.ru/strik?utm_term=spiral+dynamics+integral+theory PDF link annotation
    • https://lafotavesa.weebly.com/uploads/1/3/4/6/134633764/dumebitekaziso.pdfIn PDF document text
    • https://jizenovu.weebly.com/uploads/1/3/4/6/134682428/1346975.pdfIn PDF document text
    • https://midepixa.weebly.com/uploads/1/3/4/6/134622545/raneleg.pdfIn PDF document text
    • https://jopogerepoji.weebly.com/uploads/1/3/5/3/135307159/62d6fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469378/normal_605aa6f627196.pdfIn PDF document text
    • https://zaxewunatomilar.weebly.com/uploads/1/3/4/1/134131499/gukekoremim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383132/normal_6004d771d681b.pdfIn PDF document text
    • https://disovipogazita.weebly.com/uploads/1/3/1/3/131398104/joparuwuboxijo-xeleludef-zenejifomuto.pdfIn PDF document text
    • https://retumitoratosu.weebly.com/uploads/1/3/4/2/134234586/ea47d06e9ee.pdfIn PDF document text
    • https://wufisosudima.weebly.com/uploads/1/3/0/8/130874090/xejipawewe_xisiganudujut_lokipu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://288dffde-0386-48bd-adba-b069b5f3b70f.filesusr.com/ugd/7e1b39_dad6da8ccf5f4e2085a11e3d43e2c675.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bebb9a6f-8917-4401-8f65-06713feeac5e/troy_bilt_horse_tiller_tine_shaft.pdfIn PDF document text
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_caf5e3c2347f4e2e9f62ab461fb537f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d00884b-848b-4813-94a6-93635cf4569f/snow_white_with_the_red_hair_shirayuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fa31764-5b16-479d-9990-d514c3d505e4/99426380470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e1b9541-25ae-41e5-8082-a739627d85ac/samsung_tv_6_series_have_bluetooth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/860276df-a1b5-41af-9764-51d0bd31feca/army_golden_master_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d733fc38-a19e-451b-84d4-a19d9ef3abb5/mogojidox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89f2a9b6-6cb1-41b6-aef0-1b6e0fe88f19/shakespeare_sonnet_106_paraphrase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfe18eb6-4189-4d4c-a747-fa05ac031507/xunebatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3effc196-91c2-45f8-aff9-66c4db1ae07a/wajifelomuxosazomilenan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ca26d1e-2f0f-4bef-9ab7-12ead32c52e7/18642324832.pdfIn 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_off0000f50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 5692 bytes
SHA-256: 4fc7b53027e245025c83ad1cb21e5a29fa20d7dd4336a52bb7f0eada08e53e6d
font_01_sfnt_off00010847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10847 10744 bytes
SHA-256: fc441df2c040baad17ce118ee3fb4519345f82be264d7b34fd4ce005d7c2dc4e

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