Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e906b5727cd755b…

MALICIOUS

PDF

72.5 KB Created: 2021-03-13 13:54:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8873289fff09dd227e5ef60f47459aac SHA-1: f2b7ef2cff58f028641b6c191940f36ca67fce9a SHA-256: 8e906b5727cd755b4dfe42d72e9bb62169e49241aca6b60cef145c66756d7a41
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The primary URL, https://jacksth.ru/strik?utm_term=casio+illuminator+price+in+bangladesh, is likely intended to redirect users to malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and extensive link farm activity indicate a malicious intent to drive traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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://jacksth.ru/strik?utm_term=casio+illuminator+price+in+bangladesh PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369307/normal_600b6e997f624.pdfIn PDF document text
    • http://a1metromovers.com/79901348854zv5xh.pdfIn PDF document text
    • http://glawerry.online/60428965355suue7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483089/normal_5ff3ace821da8.pdfIn PDF document text
    • http://productwood.ru/5795000083811uzp.pdfIn PDF document text
    • http://istra-backwater.ru/103927885419b6s2.pdfIn PDF document text
    • http://fresh-ita.space/bufemujuwotar9g35m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416318/normal_600d798cc3415.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476750/normal_6029cdd8cfe58.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/140f1abb-3bb7-4a4f-98ce-209938193301/pressure_washer_hose_and_gun_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a83e99d4-a32d-4531-8978-48263f44fe78/harry_potter_paperback_box_set_costco.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/wewubin.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/54849196036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d6a3f4-eab3-496d-a477-9644ca348049/vovaruv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f279b148-e735-4927-b359-f6f4eb7077f9/2013_chevy_volt_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/how_to_operate_ge_front_load_washer.pdfIn PDF document text
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_e4c19bccb3244d8f901570d49aeebe1f.pdf?index=trueIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_fbe5f1a6880841fe8d70bb6d248f6b01.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/mariners_apartment_complex_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2b4648e-d210-4f86-8143-658323fbc48c/how_to_program_a_universal_ge_remote_control.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd048e67-bb5b-4091-9dd6-00ebd64ec968/how_many_horsepower_is_a_55_lb_thrust_trolling.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79C 5532 bytes
SHA-256: 87db5f44f26353974d9917bd5604110d15369ec943f8670c9a691306399eaa84
font_01_sfnt_off0000da29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 3852 bytes
SHA-256: fb9a9d6d956734aafa617145bc4294d680f35380ebfe4cccb0c41768ced05ec5
font_02_sfnt_off0000e628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 9328 bytes
SHA-256: d25b79c210004fbd587b4f02c9f51fa624bc63f25e8894c85d8dae43363c2dac
font_03_sfnt_off00010613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10613 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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