Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b5ad31cf4849eb…

MALICIOUS

PDF

70.8 KB Created: 2021-03-08 12:36:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f79e6805c5b9b59531af7d020bb13275 SHA-1: a954e822815d6622fc139be3174b4568a87ee830 SHA-256: 52b5ad31cf4849ebc7e1c644028f56587a66bc30074e271a0236826d0418d0ef
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to other PDF documents, suggesting a tactic for SEO manipulation or potentially distributing further malicious content. The presence of many disposable hosts and UTM parameters in the URLs further supports a malicious link farm operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://zajinet.ru/wix?keyword=marysville+lions+club PDF link annotation
    • https://cdn.sqhk.co/rodesedaded/7hcHFjg/janozanesiwemuwilanixov.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/XpAHbkm/25497558490.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/what_foods_are_both_gluten_and_dairy_free.pdfIn PDF document text
    • http://raisinshq.pro/88350660578tqxtl.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/keurig_2.0_k_carafe_hack.pdfIn PDF document text
    • http://xazonojader.mywebcommunity.org/47907887940.pdfIn PDF document text
    • http://s-tochka.ru/wobiperazipovotosemav81s4.pdfIn PDF document text
    • https://cdn.sqhk.co/buwuvibija/ghjdicU/fiberglass_sheets_for_boat_building.pdfIn PDF document text
    • http://ladiluvame.mypressonline.com/16478741215.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/7db382bb-1c19-4980-b31b-6690f213df92/55045959212.pdfIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_57578090f555448aa10627af92aecc36.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d5abe45-5e5a-47f2-97e2-981497748a6c/nintendo_wii_wifi_error_code_51330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5c428bc-20fe-4fa4-bed5-0f56cb7d94fd/45765501296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d52db1a-28cc-4691-8621-e1e53297375a/what_jobs_can_you_get_with_a_bachelors_in_social_psychology.pdfIn PDF document text
    • http://vejegaba.atwebpages.com/what_is_the_main_cause_of_piriformis_syndrome.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_926956a559dd46ffb6dc123d1b27e92c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/05c367e5-ed3c-4188-96cb-57aed7ba1e86/english_chinese_dictionary_app_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60132a54-3bd7-447b-a51e-4c89494ecb8d/matokijorufuvutonorera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecf30f0e-1f8e-4be8-afb7-807f06e2652a/kunimasupezawitabodago.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_off0000d9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BC 5100 bytes
SHA-256: c16c1b813e1d647a51795ef9c2435d76a2ec547c40a51787fdea5342a09db23f
font_01_sfnt_off0000eb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB40 10264 bytes
SHA-256: 296b6843e36b12bedadafdfba050953d1346a904b04ae6261e9de197d7b541a4

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