Malicious PDF — malware analysis report

Static analysis result for SHA-256 b821e40ddf0ffb35…

MALICIOUS

PDF

96.8 KB Created: 2021-04-10 20:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e214c4cca7f2666254335803a566434 SHA-1: 2ae2a7dd0585292681eeb7b1dd64343818a92d35 SHA-256: b821e40ddf0ffb3586509c5a908dd21394b654624ded48f5c7168839fdc59ebc
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL being dafemum.ru. The document body, though heavily obfuscated, suggests a lure related to 'Top water resources engineering firms'. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 4

  • 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.
  • 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://dafemum.ru/strik?utm_term=top+water+resources+engineering+firms
    • https://cdn-cms.f-static.net/uploads/4446774/normal_603e3383cf1b7.pdf
    • https://static.s123-cdn-static.com/uploads/4365580/normal_5fedcde6b4f65.pdf
    • https://cdn-cms.f-static.net/uploads/4369773/normal_606c0d6acf517.pdf
    • https://static.s123-cdn-static.com/uploads/4417119/normal_5fedf88fa6cd1.pdf
    • http://uaportal.site/296890595946gtij.pdf
    • https://cdn-cms.f-static.net/uploads/4457586/normal_605311226849e.pdf
    • http://ig-mediateam.net/11107798732idkn1.pdf
    • https://cdn-cms.f-static.net/uploads/4388421/normal_60286485258ba.pdf
    • http://sberbank.services/degree_needed_to_be_a_public_relations_directorgxrz1.pdf
    • https://cdn-cms.f-static.net/uploads/4416796/normal_601f2dd4c5847.pdf
    • http://sodahq.club/lukigefaxilajipepu4mvzw.pdf
    • http://lnstagramcopyrightcenter.com/java_interview_preparationnz5lj.pdf
    • https://kopepadozuko.weebly.com/uploads/1/3/4/5/134505487/petizefalizumip-mukoni-zepivig-bedorisafaf.pdf
    • https://cdn-cms.f-static.net/uploads/4453134/normal_606e2d2473e87.pdf
    • https://tevufipe.weebly.com/uploads/1/3/1/6/131606546/6280359.pdf
    • https://cdn-cms.f-static.net/uploads/4452376/normal_604167d0bd852.pdf
    • https://fabisinutufonos.weebly.com/uploads/1/3/5/9/135993578/6413911.pdf
    • https://static.s123-cdn-static.com/uploads/4465387/normal_5fc9cbe23b9e0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_806a26c7275f4e068bd6779dcd7dea0d.pdf?index=true
    • https://s3.amazonaws.com/gomakobez/19233345935.pdf
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_7a114d1ed2c0462f9655bb98d541aebd.pdf?index=true
    • https://55afd15b-9a96-48ff-beb6-d705f4765584.filesusr.com/ugd/8b06a9_9f0eea96c382415da79704ab67614507.pdf?index=true
    • https://s3.amazonaws.com/gupawupigawono/dokurudejuwevu.pdf
    • https://s3.amazonaws.com/farefasejikap/10912108779.pdf
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_2d76efeec63645e7b9a00466b0cc76c7.pdf?index=true
    • https://s3.amazonaws.com/metubevozisul/91543413708.pdf
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_cd37e7518ee84e64aa8d222085b9fa72.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c13.bin
c82290e9baeec9748f4eef8e16cb526548f693465672e8d999bff60e3b731494		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C13 5344 bytes
font_01_sfnt_off00014e3f.bin
8dbda0e69c3c89ab254b29a113d50ddccdce9e3eca51f79d936a0857fe515f79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3F 11528 bytes

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