Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56fc09812e00692…

MALICIOUS

PDF

77.4 KB Created: 2021-04-22 04:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7e5296cd8cbd2d3301f2e18ea7227c61 SHA-1: 2f0c3be542b584812f943e539a63d6c4ece883a1 SHA-256: d56fc09812e00692b5e828b333eae0092763a91d7ef8ec139b7fb0108d9f6ae9
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain product-related text, suggesting a lure to disguise the malicious links. The ML classifier also flagged this PDF as malicious, increasing confidence in its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=casio+mens+g-shock+black+watch+ga-150-1aer In PDF document text
    • http://fevuworejefe.iblogger.org/rirexajunutumapasod.pdfIn PDF document text
    • https://cdn.sqhk.co/farovufu/OtUnwgg/pasudizowov.pdfIn PDF document text
    • https://cdn.sqhk.co/zorimedi/ilb2jfd/lowukogegewonifox.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/32765394599qp7d4.pdfIn PDF document text
    • http://gravkamen.ru/22451403296ouwzs.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/7PalLLM/fipoduvefaponugijizizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459034/normal_602e656df1cb2.pdfIn PDF document text
    • http://maykistore.ru/fufowuwoenzc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402246/normal_6037628de31ba.pdfIn PDF document text
    • https://cdn.sqhk.co/bazexolareja/0Kgcvgg/34028325451.pdfIn PDF document text
    • http://pizidojokinesa.66ghz.com/pdf_biomassa_de_banana_verde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446147/normal_604024bc8121e.pdfIn PDF document text
    • http://podeves.xyz/87542396946oveg0.pdfIn PDF document text
    • http://nopefujozake.iblogger.org/number_conversion_binary_decimal_octal_hexadecimal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457586/normal_60414c23d8dce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460709/normal_60669da877221.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/8745dba0-7543-4a96-a528-a0c59fcfd52e/drama_triangle_worksheet.pdfIn PDF document text
    • http://vosimamasi.epizy.com/american_history_book_for_middle_school.pdfIn PDF document text
    • http://kikasipab.epizy.com/69223290369.pdfIn PDF document text
    • http://giwetigimibe.epizy.com/220v_ac_12v_dc_transformer.pdfIn PDF document text
    • http://ferugasa.epizy.com/jemikesadujega.pdfIn PDF document text
    • http://betupaxomivokab.epizy.com/52915873599.pdfIn PDF document text
    • http://wajiletum.epizy.com/90787100474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1af343d-ee5a-4339-9754-fb9760ce4f29/how_to_repair_a_whirlpool_washer_agitator.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_off0000ed43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED43 5764 bytes
SHA-256: 11f7623e535912c3573c9f8a455f8466802c58e4278a6b84ffa29e25adc3f03a
font_01_sfnt_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 10968 bytes
SHA-256: 69385ce714c3047e1dafa5143419f379c5ca2dbff3cd37f9c8a8cfeb1f995330

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