Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0e63880ddfddb2…

MALICIOUS

PDF

78.2 KB Created: 2021-03-26 03:11:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f1f02c9e257f918a2b7cab1815849601 SHA-1: f72b72d3e60e78eee37cff43507e83a4871e6002 SHA-256: 1a0e63880ddfddb21b96a5accf54f25a0ee78214a2fbfdcb5e109fa3a800b9e8
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It contains a link farm with numerous external URLs, including one pointing to jottigo.ru, suggesting an effort to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to reference health guidelines, likely as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/123?utm_term=acc%252F+aha+high+blood+pressure+guidelines+2017 PDF link annotation
    • https://jedinelig.weebly.com/uploads/1/3/5/9/135982929/8998865.pdfIn PDF document text
    • https://zataxusesuta.weebly.com/uploads/1/3/4/3/134311667/d41890476d7e97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422890/normal_60085fd35b0b8.pdfIn PDF document text
    • https://cdn.sqhk.co/gukovafax/Bgdo8ij/hero_xpulse_200t_mileage_test.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443819/normal_5fe88936cb031.pdfIn PDF document text
    • http://neroveruturom.iblogger.org/differential_and_integral_calculus_problems_and_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/tefupudoma/qhghghe/51437426448.pdfIn PDF document text
    • https://xurarasetar.weebly.com/uploads/1/3/4/0/134096945/nawolerel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_a4be28100a07472d804939cd7c79d1e2.pdf?index=trueIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_930d2419b1354ebc9250fc6b689ad7f3.pdf?index=trueIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_d9f434a6d36f4493ac2bc3bc3b5886c7.pdf?index=trueIn PDF document text
    • http://menepanago.rf.gd/fetal_distress_diagnosis.pdfIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_49370e37b4c943039434b53581e8d6b3.pdf?index=trueIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_cce3f1ecfd14400e997f0cc0ebe053cb.pdf?index=trueIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_73044aaedab2409289dea0e365e9f0ca.pdf?index=trueIn PDF document text
    • https://63fde035-29f6-405b-9c66-a514c013759e.filesusr.com/ugd/4b68be_43704b7247df4d559b9fd66ee2f6d664.pdf?index=trueIn 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_off0000f2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B2 5904 bytes
SHA-256: 7ca4fe12728df18c6301463e05ac2c93c83a7c7c09e3c0f2982399c7fe5dc741
font_01_sfnt_off000106d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 11096 bytes
SHA-256: 9f782a03ae72f5f0708bf599385e5dca0fae329626b78268ff2059e50f229cd8

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