Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ddc67dc6893abda…

MALICIOUS

PDF

74.7 KB Created: 2021-04-20 15:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8673ed4b87effced53b5e0caf728a9ee SHA-1: 5b4560d284563fd83b19a992baeac28f19709711 SHA-256: 9ddc67dc6893abda3709c82a7a91b2cb0729474a23c126a5725ab79e4fc66543
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URLs and the PDF structure suggest an attempt to redirect users to potentially malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=how+to+fix+an+air+compressor+pressure+regulator PDF link annotation
    • http://mozaduz.mygamesonline.org/33017525531.pdfIn PDF document text
    • https://cdn.sqhk.co/vedimurami/IjghSic/automatic_reply_text_example.pdfIn PDF document text
    • https://cdn.sqhk.co/xixumobun/ciggiqQ/toxasiwukorarelijiziri.pdfIn PDF document text
    • https://cdn.sqhk.co/bibobovezave/hhGPxr8/broken_heart_pictures_free_download.pdfIn PDF document text
    • http://demaxapap.22web.org/poker_rules_2_pair_kicker.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/fieghJC/tubiruzavejugarive.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_5dfae6532875417b9a6b8ccb2b91277f.pdf?index=trueIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_0e295c2f0adc4608acc07e862c450960.pdf?index=trueIn PDF document text
    • https://dfdccaec-9019-42eb-ab8c-14eed22d5f88.filesusr.com/ugd/2e00cc_4536cdf9a51b42caa72d22d396dee18d.pdf?index=trueIn PDF document text
    • http://sonatalub.epizy.com/what_documents_are_needed_for_a_hawaii_state_id.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/785ddc86-457d-45bd-8c3b-fee2c271f817/81523992255.pdfIn PDF document text
    • http://jimomug.rf.gd/buvapana.pdfIn PDF document text
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_01a9ce5580d449f7bb6480bf3541e75e.pdf?index=trueIn PDF document text
    • http://mafonevaverazux.atwebpages.com/45705469392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b081419f-dc11-4413-b569-dd6751172ff7/the_bobo_doll_experiment_is_an_example_of_what_kind_of_learning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93d8ed6a-f16f-4d71-85a9-38f04cd4a062/fifth_grade_persuasive_writing_examples.pdfIn PDF document text
    • http://bironibubelad.rf.gd/ceremonial_magic_and_sorcery.pdfIn PDF document text
    • https://368af19b-b9be-4417-8ea7-dfc4611f9fec.filesusr.com/ugd/abd4c0_0ac0d4fe93e34b63b4fe673bdf51330c.pdf?index=trueIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_7a26195780c344a68761ec0e5c8ac16c.pdf?index=trueIn PDF document text
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_736087cd4c694289b14c82a0db06f54f.pdf?index=trueIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_46466e848eb54a2a93743c0dbbbf0a4e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e77ab5a8-d2bd-49f9-8ff8-23eaddcb55d0/casio_baby_g_shock_watch_battery_replacement.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_off0000e627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE627 5456 bytes
SHA-256: 096bafddc93d6b9ffe60e8783649602fe41a3363fa100f00132987bd0dc6dd43
font_01_sfnt_off0000f8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 10816 bytes
SHA-256: 19b4146da56eaf9158bc5344d8dda32007d4055d8057f4397d7e35b6a57077f5