Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66578fe9b2bed48…

MALICIOUS

PDF

78.9 KB Created: 2021-04-03 13:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d7136bfe983b44970acec35599363b8b SHA-1: cdf15053594b86cc55c89cc3a637215ea6ce8b2b SHA-256: c66578fe9b2bed48720acc7add4deee02fe5873eb5d7bfe1f39677a5227f5a00
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The primary URL, https://gimoguvi.ru/strik?utm_term=how+to+set+the+time+on+a+citizen+eco+drive+radio+controlled+watch, is likely part of this malicious infrastructure. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=how+to+set+the+time+on+a+citizen+eco+drive+radio+controlled+watch PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378160/normal_5fc7ab3d3bc82.pdfIn PDF document text
    • https://xatotaga.weebly.com/uploads/1/3/4/7/134726025/7b12198be71c3e7.pdfIn PDF document text
    • https://posokirotol.weebly.com/uploads/1/3/2/8/132814476/tamibekure_vavaregewegiwi_xogivawaruvuna_riroboxuzemoper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425908/normal_6053100f6a435.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444117/normal_5fef8120e3544.pdfIn PDF document text
    • https://tatedugede.weebly.com/uploads/1/3/4/3/134311852/88c35.pdfIn PDF document text
    • https://vumeganutubaxo.weebly.com/uploads/1/3/1/4/131406578/bc58ee20b70.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/9530780.pdfIn PDF document text
    • https://betataniboluwi.weebly.com/uploads/1/3/0/9/130969090/fitiz-rijiro.pdfIn PDF document text
    • https://lilonukile.weebly.com/uploads/1/3/4/7/134767916/51b77e114039.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417824/normal_5fde3bd270d73.pdfIn PDF document text
    • https://tewetakejuduz.weebly.com/uploads/1/3/2/7/132740850/200501233713306.pdfIn PDF document text
    • https://menuwenuxunok.weebly.com/uploads/1/3/4/6/134682317/sikisakipab-gofumowijeja.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/9d1a2ae2-ccdd-4bc7-bba7-e7ba1fd275e0/4642038055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3b3a7b9-dd9b-41c0-a8a3-c890d03bfa1b/me_and_earl_and_the_dying_girl_full_movie_stream.pdfIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_b6cff57bd0f84680b19e4cc45917caec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5ca7502-bfa4-493d-a765-99c92c1ee085/69194068783.pdfIn PDF document text
    • https://8458b573-1d6d-478c-912c-b10a972f31df.filesusr.com/ugd/150112_f117e502a850479ca1212cee1e9869bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/45dc82fa-860b-495f-99f3-b4825d54aa2a/apple_tv_3rd_gen_app_store_missing.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_ba3ef001d6174c8ba0438b11741d285b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/50950114-8e2c-4684-8d58-ebf26a2df4c7/jepagifujumojamarubako.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_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 5340 bytes
SHA-256: 36f248f1869e4b4c4d1d5211d97fe7812da8ff1bef60f81e029ac5797aead4a2
font_01_sfnt_off0001084c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084C 11000 bytes
SHA-256: a1059a7354c03f9b1a21b36799de4850a39e6890c3655c33b36cad7d2bd389d0