Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b3d576f79e4e51…

MALICIOUS

PDF

139.9 KB Created: 2021-04-07 03:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e29267de1fd6d51c4fa4acee53da822e SHA-1: 455317e62d7ecb4c34e24774d4cac8990aa12787 SHA-256: 91b3d576f79e4e5174ff6be9004dd89111ef50300268e0dd749193266b4af9d2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a 'PDF_SEO_LINK_FARM' which indicates a mass of external PDF links. One of these links, 'https://zajinet.ru/strik?utm_term=after+virtue+summary', is identified as a potential malicious URL. The ML classifier and ClamAV also strongly indicate maliciousness, classifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to direct users to malicious content, potentially for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://zajinet.ru/strik?utm_term=after+virtue+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457011/normal_5fd76ff63fe28.pdfIn PDF document text
    • https://nuwosalu.weebly.com/uploads/1/3/4/4/134497214/nifefivumopapibez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490917/normal_5fd9050e97d71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419640/normal_5fc94cf7309a3.pdfIn PDF document text
    • https://poteluteko.weebly.com/uploads/1/3/1/1/131164474/2378695.pdfIn PDF document text
    • https://roralolew.weebly.com/uploads/1/3/0/7/130775143/fuwenuzaw_gozetopogupu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/bosufezi.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/lejuxavotazefisefowu.pdfIn PDF document text
    • https://88e92b2d-3ddf-41b2-a2ae-4af48bfba274.filesusr.com/ugd/b74686_9829330c4ca64a848a31cb0c5e2d2460.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/dunkin_donuts_breakfast_sandwich_nutrition.pdfIn PDF document text
    • http://numigufe.rf.gd/mitologia_griega_y_romana_pierre_commelin.pdfIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_c62c06f290e549eea0822d752d5e280c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zijivevip/al_quran_free_app_download.pdfIn PDF document text
    • http://sujosoxajixojiz.epizy.com/naming_alkynes_worksheet_with_answers.pdfIn PDF document text
    • https://3778afa4-e5d9-4bb6-be54-d343c89b577b.filesusr.com/ugd/11c894_43fd365b3b394047bc22dc61379c8876.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/91995819158.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/91305524510.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/how_to_put_instant_pot_on_less_normal_more.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_off0001ea0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA0C 5032 bytes
SHA-256: 9950cc4aa7f6d4ae8d8eaefbbea042ded875046e3dce4bdfcdfe289593a12f70
font_01_sfnt_off0001fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB22 11020 bytes
SHA-256: a2cf5e46267c942376c6442d83afd4e5c26d0c7f647e3e03e0a26e30cefdfc40

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