Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb2e92a160cb4a9…

MALICIOUS

PDF

82.9 KB Created: 2021-03-15 04:31:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 501fe48697048d16ed249484794ee4db SHA-1: 912e4ac3c681e418ce91a777ce0ca110b4dd421c SHA-256: 1cb2e92a160cb4a9175f6866b3479e5b2a39e46c3d26153bd41c41afc730e64d
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 disguised as educational materials, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document, likely used as a lure to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/award?keyword=two+step+equations+with+fractions+and+decimals+worksheet+pdf
    • https://cdn-cms.f-static.net/uploads/4407989/normal_601760df6d7d5.pdf
    • https://cdn.sqhk.co/gokitoser/YL02HiR/7_wonders_duel_agora.pdf
    • https://cdn-cms.f-static.net/uploads/4485445/normal_60311fde0c0fc.pdf
    • https://static.s123-cdn-static.com/uploads/4388413/normal_5fdfff9dbad74.pdf
    • https://cdn.sqhk.co/garisuvonuk/ghieMOr/62133671637.pdf
    • https://cdn.sqhk.co/wekaradukuve/blicgfb/76835762541.pdf
    • http://tojagetuwiger.iblogger.org/3471038519.pdf
    • https://cdn-cms.f-static.net/uploads/4383687/normal_602928c1d77b3.pdf
    • https://cdn.sqhk.co/nemoludajedu/gGogdih/vawosatoketudefogavavulu.pdf
    • https://cdn.sqhk.co/lekibapufe/jgghjgd/bebab.pdf
    • https://static.s123-cdn-static.com/uploads/4373239/normal_5feb96ca05a3c.pdf
    • https://cdn-cms.f-static.net/uploads/4416143/normal_604e35a85f580.pdf
    • https://cdn.sqhk.co/suwajipufo/iifjahh/tipilagelusurinejusabagi.pdf
    • https://cdn.sqhk.co/widagawinud/7hjxe9L/angular_6_template_driven_form_validation_example.pdf
    • https://cdn-cms.f-static.net/uploads/4465133/normal_60372b5a7a729.pdf
    • https://static.s123-cdn-static.com/uploads/4406809/normal_5fcf68a7767ae.pdf
    • https://cdn.sqhk.co/zujubokave/cTj0XCh/supolixomalerifirim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_18fd67be7b0546059c8e360b825c0df0.pdf?index=true
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_a22815c8f0bd4b0ba35c6b20af2e2c9e.pdf?index=true
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_8a4a20cada244c79be7fd8fd5800d26d.pdf?index=true
    • http://jisixapuwalim.epizy.com/82188838097.pdf
    • http://vilaxetewutino.epizy.com/original_gorilla_glue_technical_data_sheet.pdf
    • http://kutoduno.rf.gd/libros_minimalismo_gratis.pdf
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_ff4bca94a5db49c2835d0c4a0779773b.pdf?index=true
    • http://deroselewem.epizy.com/41052447445.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f52b.bin
a3d278143514cd163f0e0aaa69b7eff584d333cbe14db487a8d0c59f71722247		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF52B 5508 bytes
font_01_sfnt_off000107c3.bin
1f6f0ac00b9390f6ee6d57114904dfc24fce89911c25c2162572d89268bc883e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 10904 bytes
font_02_sfnt_off00012ce8.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE8 4324 bytes

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