Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d5b56537181bf9…

MALICIOUS

PDF

79.4 KB Created: 2021-03-14 02:13:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5f418d65d9e0ae4435e68aebca70823 SHA-1: 5f1141d958e3dbfdceb06785d793b6610b3ba3e9 SHA-256: d6d5b56537181bf9a120aa3673745d5452e5128c9ff2fe0a84f543a551fb953f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, https://nipisod.ru/strik?utm_term=arris+tg862+router+reset+password, is likely intended to lure users into clicking it by appearing to offer router reset information. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=arris+tg862+router+reset+password
    • https://tekitoloveda.weebly.com/uploads/1/3/1/0/131070611/domiworedamixok_mazeve_towureju.pdf
    • http://fitdieta.com/plutchiks_wheel_of_emotions8mhs6.pdf
    • http://dkblogin-de.com/values_worksheet_middle_schoolttuhx.pdf
    • http://jesiwufap.iblogger.org/across_the_universe_full_movie.pdf
    • https://marejipafikelor.weebly.com/uploads/1/3/1/4/131437604/6909174.pdf
    • http://renijulemigato.iblogger.org/24139660855.pdf
    • https://mawebugejememed.weebly.com/uploads/1/3/4/5/134599942/58d95.pdf
    • https://nazuvunu.weebly.com/uploads/1/3/4/4/134438845/5e3f9a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/dosalapasenow/98338177912.pdf
    • http://jemewipubiwu.epizy.com/serenity_prayer_in_hindi_download.pdf
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_529ca882a30043e9bba14318685f121e.pdf?index=true
    • https://s3.amazonaws.com/sumesawoxajew/xakeruborirumaturij.pdf
    • http://sozanizitug.epizy.com/62105998355.pdf
    • https://s3.amazonaws.com/timeziso/42726888554.pdf
    • https://316b94d8-f1eb-4552-9621-e6dada6029ed.filesusr.com/ugd/4b675a_9d7843d935e9497b9a45b1cde73c8a54.pdf?index=true
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_b1b97e1984934da3bb8c5fa6936de3da.pdf?index=true
    • https://s3.amazonaws.com/sajatofubote/the_magus_era.pdf
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_68756696f80e452bbb19373b590a7442.pdf?index=true
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_1377da39f0514f5f8c88db4f954eddc6.pdf?index=true
    • http://lixanixuzuki.rf.gd/roribewagatilid.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea2a.bin
7516ebbf538536c5f45ec51551a768be4ba9ae9f59ab7054914ea7edf5f00a10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2A 5432 bytes
font_01_sfnt_off0000fcc2.bin
b98845145e317ec88f42664401599896e63fc6a351ec5132e82f76f52be567be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 10816 bytes
font_02_sfnt_off000121ab.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121AB 4324 bytes

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