Malicious PDF — malware analysis report

Static analysis result for SHA-256 72607c9f24cbb5a6…

MALICIOUS

PDF

82.1 KB Created: 2021-05-28 22:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6bdff976f01fb5a379f2537078418b52 SHA-1: a3c0d21bb474962765c536d4930ef6acf9c4d6e4 SHA-256: 72607c9f24cbb5a6b6617a0db4c505480283cf4dad60fe778ad4b5f93dd1f4f2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'Diablo 1 belzebub sorcerer guide' and authoring information, suggesting a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • 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://baarspo.ru/123?utm_term=diablo+1+belzebub+sorcerer+guide PDF link annotation
    • https://betedodokadez.weebly.com/uploads/1/3/4/8/134882186/fiwowunuloporas-naxesoniz-xizepapurex-wobugimon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495390/normal_603fc52194f9d.pdfIn PDF document text
    • https://dobumixil.weebly.com/uploads/1/3/0/7/130738680/mosaserefuwipaza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_6054d57c4ebc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388048/normal_6017b4073e25e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412778/normal_60350667e6b56.pdfIn PDF document text
    • https://bapumuper.weebly.com/uploads/1/3/1/1/131164114/nakewenipovurek-vovelexoditaz-kuxitesu-kowam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412896/normal_6064723ce1e9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499629/normal_5ff07b69203e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474722/normal_6014c0f05ab1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392210/normal_60057b89033dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490125/normal_5fdb312d3953d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486035/normal_5fd8867bec147.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/907ecd49-eab5-4572-8a6e-6a1f4ee479dc/moxowez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a7e27e7-18c0-4a73-9403-f950cd3d81cd/vezuzudoturujuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85180a9b-a08b-420a-b4f7-4798f8c6d3e4/how_long_to_cook_spiral_ham_at_350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08fc8087-ebe0-4fe2-a4b8-c0b96d1d60fd/74754693251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33349906-719d-4288-ac03-67a163a866b9/first_aid_usmle_step_2_ck_10th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c30f30e-f9d0-4bf5-87e9-f5bb3a1b99f2/ryobi_bench_drill_press_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59f29d8a-4a89-4ee4-b6e8-2180b0ae9f62/what_caused_the_first_agricultural_revolution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd197ce5-90ce-4b09-b71a-ee884e521b23/84481653144.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de134186-0627-4882-8e14-da08ca5ab523/99410716117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efc5db77-fcd1-4ffd-9e39-26c55541ea82/22800115984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe556941-f1f7-4a97-9b8a-68523af2dfd5/netbeans_java_programming_tutorial.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 5044 bytes
SHA-256: 8c8c39307be1bb924f30f73e94a2ed33055407f7813b0a462cb84182c6af82a5
font_01_sfnt_off00010554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 11044 bytes
SHA-256: 5c43458c6e82c50f8e6858828b55fa7878085e9bacdb9ad395034302695b48ae
font_02_sfnt_off00012ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD6 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2