Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1c2232af2496dc…

MALICIOUS

PDF

79.8 KB Created: 2021-05-07 11:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 61b400e392f324620addb170a9664318 SHA-1: 439b6b309b08593b4d0454a60516091d653fdfca SHA-256: 7f1c2232af2496dc9cd2cee3eb7f11a1f870302514361dfe978a759366e0f07b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or suspicious domains. The ML classifier also flagged this PDF with high confidence. The document body appears to be corrupted or obfuscated, but the presence of a link to 'yafferge.ru' and the 'PDF_SEO_LINK_FARM' heuristic strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://yafferge.ru/strik?utm_term=dream+meaning+dog+bite+left+arm In PDF document text
    • https://novadoja.weebly.com/uploads/1/3/4/8/134873208/e39b20579b4147b.pdfIn PDF document text
    • https://nikovazof.weebly.com/uploads/1/3/2/6/132682709/ef84f4d675fb.pdfIn PDF document text
    • https://dijibelusubif.weebly.com/uploads/1/3/4/8/134871127/5b010c1.pdfIn PDF document text
    • http://wowitaly.space/types_of_bowline_knotsrew5g.pdfIn PDF document text
    • http://parkji5x.xyz/sexovowawuziniretn2cn.pdfIn PDF document text
    • http://x-bionic.shop/xitenumozatkhm93.pdfIn PDF document text
    • https://kezozebajex.weebly.com/uploads/1/3/4/2/134265808/tawijowi.pdfIn PDF document text
    • http://twirlini.com/endocrinologo_sistema_linfaticoewjgn.pdfIn PDF document text
    • https://mazemisa.weebly.com/uploads/1/3/4/6/134692176/0fcd5.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://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_238e3a6d0b9148a98fdb17d1cfa4a859.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/fft_wotl_onion_knight_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/bloomfield_township_police_reports.pdfIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_410fa09034764676b783c45c722ed440.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f6125a3-4de7-4687-9785-409d8b5ecb8f/the_trials_of_apollo_box_set.pdfIn PDF document text
    • https://22e44a25-5b44-49ab-8bd1-9de78d2943b2.filesusr.com/ugd/cce535_e853b36abbdf48cf953f01108dfb4ff0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/34663585372.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/coreldraw_2018_full.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/creative_answers_to_how_are_you_doing.pdfIn PDF document text
    • https://52aa71f3-9574-4e96-898b-bb16aa893b2c.filesusr.com/ugd/b13a71_05bbd507c32440bbb05453b96b07bd92.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/rofatunobefifore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03367c98-b3c9-448d-bd8a-35811218cb1f/39642085345.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 4976 bytes
SHA-256: bf92b2c78ae312d14bce1eec49666e58100a5d994a49db6ab566611c0bf3ed03
font_01_sfnt_off0000fd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2A 10904 bytes
SHA-256: 222ad0a117a512a376f54870942690c36efe84231e16dde7cdc54356ad28948d
font_02_sfnt_off00012266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12266 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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