Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e050f2c6243b58…

MALICIOUS

PDF

78.8 KB Created: 2021-02-18 08:12:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f7da8297a987d8d972bdffea757e5e40 SHA-1: f19e8bac9d96bf868c08bde061cb5e460b60190e SHA-256: 57e050f2c6243b58833b7522067d71b9a5632ef32e21753dcbcbcc61130bd53d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to obscure malicious content. One of the extracted URLs, 'https://baarspo.ru/wix?keyword=download+iroot+apk+english+version', directly indicates the intent to distribute the 'iroot apk'. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wix?keyword=download+iroot+apk+english+version PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495846/normal_602c60af4397b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480905/normal_5fceac3671294.pdfIn PDF document text
    • https://nofuzuvovakiba.weebly.com/uploads/1/3/1/3/131379181/749ada836008cf6.pdfIn PDF document text
    • https://retizobokeli.weebly.com/uploads/1/3/1/0/131070240/9397038cc0.pdfIn PDF document text
    • https://lufisadoxusixa.weebly.com/uploads/1/3/4/5/134583632/5034063.pdfIn PDF document text
    • https://xawawamofolapus.weebly.com/uploads/1/3/1/4/131436997/7255854.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446283/normal_5fedb273b6bc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420245/normal_5fda911b29518.pdfIn PDF document text
    • https://serekarivevug.weebly.com/uploads/1/3/1/4/131407867/welisu_beretarujejono_tanakukuxavax_kixemis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444866/normal_5ffbb701c994e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380707/normal_5fe8ff8cdf15d.pdfIn PDF document text
    • https://pozategon.weebly.com/uploads/1/3/2/6/132695347/lokolobudalorokoso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_6013ae437135b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389084/normal_5feea888cdd50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495264/normal_5fd8c81f207c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392867/normal_5fda3f2b4e655.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kasuwevovog/nevojivan.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/gigabyte_b450_aorus_pro_user_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CF 5224 bytes
SHA-256: 3b9bbfe9ebf08be47f2f4e66286c0280a9b099b495e87ad0e24131f9243e1706
font_01_sfnt_off0000f6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 12932 bytes
SHA-256: b4427f1256ffeffa8c60678a6ce7c2813c4f51f76fa77b3934c0c2904ed4eb41
font_02_sfnt_off00012028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12028 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

Open this report in the interactive analyzer, or submit your own file for analysis.