Malicious PDF — malware analysis report

Static analysis result for SHA-256 b766ab52619988f5…

MALICIOUS

PDF

83.6 KB Created: 2021-05-21 15:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7801b13c94c5dd2c1e41b58f07d3842 SHA-1: eaaac1e695a62471a22d7f6271846c8d8b93b268 SHA-256: b766ab52619988f5a29f4c07581fa144c84aa1c5360afcbfd0aabccad6993d92
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 pointing to Weebly-hosted PDFs, indicative of a link farm or distribution network. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to 'gallery app for android 2018', suggesting a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=best+gallery+app+for+android+2018
    • https://panebafizi.weebly.com/uploads/1/3/4/3/134365464/kibapoxeg.pdf
    • https://cdn-cms.f-static.net/uploads/4485014/normal_60222efa72ef0.pdf
    • https://duxuremi.weebly.com/uploads/1/3/4/6/134623812/xujebubam_biporegem.pdf
    • https://cdn-cms.f-static.net/uploads/4470683/normal_6048d542f1d97.pdf
    • https://badexakabenal.weebly.com/uploads/1/3/4/0/134017850/87cf7eb.pdf
    • https://jejegufixi.weebly.com/uploads/1/3/2/7/132740716/lurudubukog.pdf
    • https://jumuvive.weebly.com/uploads/1/3/0/7/130776409/603d63999e.pdf
    • https://static.s123-cdn-static.com/uploads/4367297/normal_5ff7d4526f10a.pdf
    • https://dofemavuxowag.weebly.com/uploads/1/3/0/7/130739836/6074108.pdf
    • https://fexiganariv.weebly.com/uploads/1/3/0/7/130739648/dexiranepisixu.pdf
    • https://fiwixenolo.weebly.com/uploads/1/3/4/4/134493020/xifiwi.pdf
    • https://cdn-cms.f-static.net/uploads/4367922/normal_6036fd29722e2.pdf
    • https://mubuxepuvu.weebly.com/uploads/1/3/1/3/131383429/a94501e84.pdf
    • https://cdn-cms.f-static.net/uploads/4366050/normal_6039c6f9f1d43.pdf
    • https://static.s123-cdn-static.com/uploads/4460247/normal_6000b2ec04bef.pdf
    • https://cdn-cms.f-static.net/uploads/4414487/normal_6061caaf9594c.pdf
    • https://cdn-cms.f-static.net/uploads/4374203/normal_60462133c2257.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f4a58b81-7dcd-4805-b9e5-ba1c0dcb1c10/stand_on_zanzibar_brunner.pdf
    • https://uploads.strikinglycdn.com/files/faa03be5-9df2-43a9-8f14-c4eb16c08750/cant_remember_wd_my_cloud_password.pdf
    • https://uploads.strikinglycdn.com/files/8078c011-9569-4a99-abbf-43da51940d50/brown_v_board_of_education_defendant.pdf
    • https://uploads.strikinglycdn.com/files/c6879b91-863e-4dff-9e7c-e5dd49963c25/how_to_show_data_labels_in_excel_2016.pdf
    • https://uploads.strikinglycdn.com/files/e4fb3011-3a25-412e-9659-50339621cead/dell_inspiron_3520_laptop.pdf
    • https://uploads.strikinglycdn.com/files/3a6dc859-4cb3-41b9-ad10-4b395f07cc28/what_music_is_popular_in_south_korea.pdf
    • https://uploads.strikinglycdn.com/files/c2edca42-ca84-4721-b5cc-49c9ab3b525a/gapam.pdf
    • https://uploads.strikinglycdn.com/files/7f6fae57-32da-446e-8b6b-3b2b53ef46c7/86307802176.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001072c.bin
888b1e9b80bfb97ac2deea389b0cc78feb10602fff17aac137b8289b8d5a2ba0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 5880 bytes
font_01_sfnt_off00011b52.bin
f1924c63fe93abab884a948cc628512a4400c7e47088c67d8a760acab2b67cd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B52 11024 bytes

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